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Instead, just fall back on the new '%p' behavior which hashes the
pointer.
Otherwise, '%pK' - that was intended to mark a pointer as restricted -
just ends up leaking pointers that a normal '%p' wouldn't leak. Which
just make the whole thing pointless.
I suspect we should actually get rid of '%pK' entirely, and make it just
work as '%p' regardless, but this is the minimal obvious fix. People
who actually use 'kptr_restrict' should weigh in on which behavior they
want.
Cc: Tobin Harding <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Reported-by: Dmitry Vyukov <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
Tested-by: Dmitry Vyukov <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>
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gcc 4.4.4 is too old to have full C11 anonymous union support, so
the current initialiser fails to compile.
Reported-by: Boris Ostrovsky <[email protected]>
Signed-off-by: Trond Myklebust <[email protected]>
(compile-)Tested-by: Boris Ostrovsky <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Anna Schumaker <[email protected]>
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The conditional kallsym hex printing used a special fixed-width '%lx'
output (KALLSYM_FMT) in preparation for the hashing of %p, but that
series ended up adding a %px specifier to help with the conversions.
Use it, and avoid the "print pointer as an unsigned long" code.
Signed-off-by: Linus Torvalds <[email protected]>
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Pull printk pointer hashing update from Tobin Harding:
"Here is the patch set that implements hashing of printk specifier %p.
First we have two clean up patches then we do the hashing. Hashing is
done via the SipHash algorithm. The next patch adds printk specifier
%px for printing pointers when we _really_ want to see the address i.e
%px is functionally equivalent to %lx. Final patch in the set fixes
KASAN since we break it by hashing %p.
For the record here is the justification for the series:
Currently there exist approximately 14 000 places in the Kernel
where addresses are being printed using an unadorned %p. This
potentially leaks sensitive information about the Kernel layout in
memory. Many of these calls are stale, instead of fixing every call
we hash the address by default before printing. We then add %px to
provide a way to print the actual address. Although this is
achievable using %lx, using %px will assist us if we ever want to
change pointer printing behaviour. %px is more uniquely grep'able
(there are already >50 000 uses of %lx).
The added advantage of hashing %p is that security is now opt-out,
if you _really_ want the address you have to work a little harder
and use %px.
This will of course break some users, forcing code printing needed
addresses to be updated"
[ I do expect this to be an annoyance, and a number of %px users to be
added for debuggability. But nobody is willing to audit existing %p
users for information leaks, and a number of places really only use
the pointer as an object identifier rather than really 'I need the
address'.
IOW - sorry for the inconvenience, but it's the least inconvenient of
the options. - Linus ]
* tag 'printk-hash-pointer-4.15-rc2' of git://github.com/tcharding/linux:
kasan: use %px to print addresses instead of %p
vsprintf: add printk specifier %px
printk: hash addresses printed with %p
vsprintf: refactor %pK code out of pointer()
docs: correct documentation for %pK
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This reverts commit 152e93af3cfe2d29d8136cc0a02a8612507136ee.
It was a nice cleanup in theory, but as Nicolai Stange points out, we do
need to make the page dirty for the copy-on-write case even when we
didn't end up making it writable, since the dirty bit is what we use to
check that we've gone through a COW cycle.
Reported-by: Michal Hocko <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Pull NVMe fixes from Christoph:
"A few more nvme updates for 4.15. A single small PCIe fix, and a number
of patches for RDMA that are a little larger than what I'd like to see
for -rc2, but they fix important issues seen in the wild."
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register_shrinker() might return -ENOMEM error since Linux 3.12.
Call panic() as with other failure checks in this function if
register_shrinker() failed.
Fixes: 1d3d4437eae1 ("vmscan: per-node deferred work")
Signed-off-by: Tetsuo Handa <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Michal Hocko <[email protected]>
Reviewed-by: Michal Hocko <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
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Uniformize STMicroelectronics copyrights header
Signed-off-by: Benjamin Gaignard <[email protected]>
CC: Alexandre Torgue <[email protected]>
Acked-by: Alexandre TORGUE <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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So far we completely rely on the caller to provide valid arguments.
To be on the safe side perform an own sanity check.
Cc: [email protected]
Signed-off-by: Heiner Kallweit <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>
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Chip datasheet mentions that word addresses other than the actual
start position of the MAC delivers undefined results. So fix this.
Current implementation doesn't work due to this wrong offset.
Cc: [email protected]
Fixes: 0b813658c115 ("eeprom: at24: add support for at24mac series")
Signed-off-by: Heiner Kallweit <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>
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Don't use %x and casting to print out an address, instead use %p
and remove the casting. Cleans up smatch warnings:
drivers/net/ethernet/via/via-rhine.c:998 rhine_init_one_common()
warn: argument 4 to %lx specifier is cast from pointer
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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On 64-bit (e.g. powerpc64/allmodconfig):
drivers/net/ethernet/xilinx/ll_temac_main.c: In function 'temac_start_xmit_done':
drivers/net/ethernet/xilinx/ll_temac_main.c:633:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
^
cdmac_bd.app4 is u32, so it is too small to hold a kernel pointer.
Note that several other fields in struct cdmac_bd are also too small to
hold physical addresses on 64-bit platforms.
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Some drivers like i915 start with crtc's enabled, but with deferred
fbcon setup they were no longer disabled as part of fbdev setup.
Headless units could no longer enter pc3 state because the crtc was
still enabled.
Fix this by calling restore_fbdev_mode when we would have called
it otherwise once during initial fbdev setup.
Signed-off-by: Maarten Lankhorst <[email protected]>
Fixes: ca91a2758fce ("drm/fb-helper: Support deferred setup")
Cc: <[email protected]> # v4.14+
Reported-by: Thomas Voegtle <[email protected]>
Tested-by: Thomas Voegtle <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
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Change the maintainer to Chris Lee who has access to Myricom hardware
and can test/review. Update the website URL.
Signed-off-by: Hyong-Youb Kim <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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For personal reasons, Mark Yao will leave rockchip,
can not continue maintain drm/rockchip, Sandy Huang
and Heiko Stübner will take over drm/rockchip.
Cc: Sandy Huang <[email protected]>
Cc: Heiko Stübner <[email protected]>
Signed-off-by: Mark Yao <[email protected]>
Acked-by: Heiko Stuebner <[email protected]>
[seanpaul added Heiko]
Signed-off-by: Sean Paul <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
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There's an ilog2() expansion in AT24_DEVICE_MAGIC() which rounds down
the actual size of EUI-48 byte array in at24mac402 eeproms to 4 from 6,
making it impossible to read it all.
Fix it by manually adjusting the value in probe().
This patch contains a temporary fix that is suitable for stable
branches. Eventually we'll probably remove the call to ilog2() while
converting the magic values to actual structs.
Cc: [email protected]
Fixes: 0b813658c115 ("eeprom: at24: add support for at24mac series")
Signed-off-by: Bartosz Golaszewski <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
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drm_atomic_helper_setup_commit expects that flipping of previous commits
has happened when it is called to set up a new commit. This can be violated
by commits where userspace doesn't get a flip completion event to
synchronize against i.e. legacy modesets and property changes.
The expectation is that those are done by blocking commits, which wait for
completion. Most drivers call drm_atomic_helper_wait_for_vblanks in the
commit_tail to ensure completion, but the wait for next vblank might not
actually happen if the commit didn't change any planes.
Make the wait more agressive by also waiting if no planes changed. This
is the minimal regression fix for the 4.15 kernel series. Long term
drivers should switch away from drm_atomic_helper_wait_for_vblanks and
use drm_atomic_helper_wait_for_flip_done instead.
Fixes: de39bec1a0c4 ("drm/atomic: Remove waits in drm_atomic_helper_commit_cleanup_done, v2.")
Signed-off-by: Lucas Stach <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Signed-off-by: Maarten Lankhorst <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
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We're currently calling ktime_to_timespec64() on stack garbage
hence the debug output for vblank timestamps also contains garbage.
Let's assing something to the ktime_t first before we go converting
it to a timespec.
While at it micro-optimize the ktime_to_timespec64() calls away
when vblank debugging isn't enabled.
Fixes: 67680d3c0464 ("drm: vblank: use ktime_t instead of timeval")
Cc: Arnd Bergmann <[email protected]>
Cc: Keith Packard <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Dave Airlie <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Acked-by: Arnd Bergmann <[email protected]>
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The sysfs entry "ocr" was missing the 0x prefix to identify it as hex
formatted.
Fixes: 5fb06af7a33b ("mmc: core: Extend sysfs with OCR register")
Signed-off-by: Bastian Stender <[email protected]>
Cc: <[email protected]> # v4.8+
[Ulf: Amended change to also cover SD-cards]
Signed-off-by: Ulf Hansson <[email protected]>
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The sysfs entry "pre_eol_info" was missing the 0x prefix to identify it
as hex formatted.
Fixes: 46bc5c408e4e ("mmc: core: Export device lifetime information through sysfs")
Signed-off-by: Bastian Stender <[email protected]>
Cc: <[email protected]> # v4.11+
Signed-off-by: Ulf Hansson <[email protected]>
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If set_thread_tidr() is called twice for same task_struct then it will
allocate a new tidr value to it leaving the previous value still
dangling in the vas_thread_ida table.
To fix this the patch changes set_thread_tidr() to check if a tidr
value is already assigned to the task_struct and if yes then returns
zero.
Fixes: ec233ede4c86("powerpc: Add support for setting SPRN_TIDR")
Signed-off-by: Vaibhav Jain <[email protected]>
Reviewed-by: Andrew Donnellan <[email protected]>
[mpe: Modify to return 0 in the success case, not the TID value]
Signed-off-by: Michael Ellerman <[email protected]>
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There is an unsafe signed to unsigned conversion in set_thread_tidr()
that may cause an error value to be assigned to SPRN_TIDR register and
used as thread-id.
The issue happens as assign_thread_tidr() returns an int and
thread.tidr is an unsigned-long. So a negative error code returned
from assign_thread_tidr() will fail the error check and gets assigned
as tidr as a large positive value.
To fix this the patch assigns the return value of assign_thread_tidr()
to a temporary int and assigns it to thread.tidr iff its '> 0'.
The patch shouldn't impact the calling convention of set_thread_tidr()
i.e all -ve return-values are error codes and a return value of '0'
indicates success.
Fixes: ec233ede4c86("powerpc: Add support for setting SPRN_TIDR")
Signed-off-by: Vaibhav Jain <[email protected]>
Reviewed-by: Christophe Lombard [email protected]
Signed-off-by: Michael Ellerman <[email protected]>
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Pointers printed with %p are now hashed by default. Kasan needs the
actual address. We can use the new printk specifier %px for this
purpose.
Use %px instead of %p to print addresses.
Signed-off-by: Tobin C. Harding <[email protected]>
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printk specifier %p now hashes all addresses before printing. Sometimes
we need to see the actual unmodified address. This can be achieved using
%lx but then we face the risk that if in future we want to change the
way the Kernel handles printing of pointers we will have to grep through
the already existent 50 000 %lx call sites. Let's add specifier %px as a
clear, opt-in, way to print a pointer and maintain some level of
isolation from all the other hex integer output within the Kernel.
Add printk specifier %px to print the actual unmodified address.
Signed-off-by: Tobin C. Harding <[email protected]>
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Currently there exist approximately 14 000 places in the kernel where
addresses are being printed using an unadorned %p. This potentially
leaks sensitive information regarding the Kernel layout in memory. Many
of these calls are stale, instead of fixing every call lets hash the
address by default before printing. This will of course break some
users, forcing code printing needed addresses to be updated.
Code that _really_ needs the address will soon be able to use the new
printk specifier %px to print the address.
For what it's worth, usage of unadorned %p can be broken down as
follows (thanks to Joe Perches).
$ git grep -E '%p[^A-Za-z0-9]' | cut -f1 -d"/" | sort | uniq -c
1084 arch
20 block
10 crypto
32 Documentation
8121 drivers
1221 fs
143 include
101 kernel
69 lib
100 mm
1510 net
40 samples
7 scripts
11 security
166 sound
152 tools
2 virt
Add function ptr_to_id() to map an address to a 32 bit unique
identifier. Hash any unadorned usage of specifier %p and any malformed
specifiers.
Signed-off-by: Tobin C. Harding <[email protected]>
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Currently code to handle %pK is all within the switch statement in
pointer(). This is the wrong level of abstraction. Each of the other switch
clauses call a helper function, pK should do the same.
Refactor code out of pointer() to new function restricted_pointer().
Signed-off-by: Tobin C. Harding <[email protected]>
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Current documentation indicates that %pK prints a leading '0x'. This is
not the case.
Correct documentation for printk specifier %pK.
Signed-off-by: Tobin C. Harding <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fixes from Herbert Xu:
- avoid potential bogus alignment for some AEAD operations
- fix crash in algif_aead
- avoid sleeping in softirq context with async af_alg
* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: skcipher - Fix skcipher_walk_aead_common
crypto: af_alg - remove locking in async callback
crypto: algif_aead - skip SGL entries with NULL page
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reading dpcd 0x600 cause link loss for a particular USB-C dock with
thurderbolt. workaround by avoiding dcpd 0x600 read unless it's
necessary.
Signed-off-by: Hersen Wu <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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This new helper function is advised to be used for drviers that
use the nonblocking commit tracking support instead of
drm_atomic_helper_wait_for_vblanks.
Signed-off-by: Andrey Grodzovsky <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Reviewed-and-Tested-by: Michel Dänzer <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Adding gamma changed check as condition for affected plane.
We ignored adding plane as affected if modeset was not required.
But for color management change we still need it.
Signed-off-by: Roman Li <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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drm_atomic_helper_resume now puts it for us. See relevant patch here:
https://lists.freedesktop.org/archives/dri-devel/2017-October/154268.html
Signed-off-by: Leo (Sunpeng) Li <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1001
acquire_free_pipe_for_stream() error: we previously assumed 'head_pipe'
could be null (see line 998)
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1808
dc_validate_global_state() error: we previously assumed 'new_ctx' could
be null (see line 1778)
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:148 create_links()
error: potential null dereference 'link->link_enc'. (kzalloc returns
null)
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:298
dc_stream_set_cursor_position() error: we previously assumed 'hubp'
could be null (see line 294)
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/dce110/dce110_timing_generator.c:1124
dce110_timing_generator_validate_timing() warn: variable dereferenced
before check 'timing' (see line 1116)
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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drivers/gpu/drm/amd/amdgpu/../display/dc/basics/log_helpers.c:79
dc_conn_log() error: buffer overflow 'signal_type_info_tbl' 10 <= 10
drivers/gpu/drm/amd/amdgpu/../display/dc/bios/bios_parser.c:266
bios_parser_get_dst_obj() error: uninitialized symbol 'id'.
drivers/gpu/drm/amd/amdgpu/../display/dc/dce/dce_audio.c:357
dce_aud_az_enable() warn: inconsistent indenting
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_resource.c:958
dcn10_acquire_idle_pipe_for_layer() error: we previously assumed
'head_pipe' could be null (see line 952)
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Sun peng Li <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:2760
create_eml_sink() warn: variable dereferenced before check
'aconnector->base.edid_blob_ptr' (see line 2758)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4270
amdgpu_dm_atomic_commit_tail() warn: variable dereferenced before check
'dm_new_crtc_state->stream' (see line 4266)
drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:4417
dm_restore_drm_connector_state() warn: variable dereferenced before
check 'disconnected_acrtc' (see line 4415)
Signed-off-by: Harry Wentland <[email protected]>
Reviewed-by: Sun peng Li <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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[Description]
in eDP+ HDMI/DP clone or extended configuration, audio inst changed from inst 1 to inst0.
No failure related this though, just playback device endpoint inst changed.
Also remove one addition register read.
Signed-off-by: Charlene Liu <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Signed-off-by: Charlene Liu <[email protected]>
Reviewed-by: Krunoslav Kovac <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Currently in the case where some of the allocations fail for dce110_tgv,
dce110_xfmv, dce110_miv or dce110_oppv then the exit return path ends
up leaking allocated objects. Fix this by kfree'ing them before returning.
Also re-work the comparison of the null pointers to use the !ptr idiom.
Detected by CoverityScan, CID#1460246, 1460325, 1460324, 1460392
("Resource Leak")
Fixes: c4562236b3bc ("drm/amd/dc: Add dc display driver (v2)")
Signed-off-by: Colin Ian King <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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While validation fbc, array_mode of the pipe is accessed
without checking plane_state exists for it.
Causing to null pointer dereferencing followed by
reboot when a crtc associated with external display(not
connected) is page flipped.
This patch adds a check for plane_state before using
it to validate fbc.
Signed-off-by: Shirish S <[email protected]>
Reviewed-by: Roman Li <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Within atomic check, dm_update_crtcs_state is called twice. First to
remove from the dc_state, and subsequently to add to it.
In both calls, a secondary mode-change check is done using dc-level
states. We shouldn't be doing this while removing, since a new
dc_stream_state has not been created to do the necessary comparison.
Because of this, the mode_changed flag within the DRM state can be
mistakenly set to false. Doing so only when adding prevents this.
We are also guaranteed that a call to add will come after remove, or
else the atomic check fails (and a commit will not happen).
Signed-off-by: Leo (Sunpeng) Li <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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This partially reverts
commit 4fb48bb66211 ("dc: fix split viewport rounding error").
Signed-off-by: Jordan Lazare <[email protected]>
Reviewed-by: Dmytro Laktyushkin <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Signed-off-by: Dmytro Laktyushkin <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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It is to fix: MST display failed to resume from S3
At the beginning of resume from S3, need to check if mgr->aux is
NULL. Fake MST encoder doesn't have real aux channel.
Signed-off-by: Jerry (Fangzhi) Zuo <[email protected]>
Reviewed-by: Roman Li <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Previous recout calculation fix changed recout size rounding
and affected the offset when it should not have
Signed-off-by: Dmytro Laktyushkin <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Signed-off-by: Andrew Jiang <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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Signed-off-by: Hersen Wu <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Reviewed-by: Wenjing Liu <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
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