diff options
| author | Jia-Ju Bai <[email protected]> | 2018-12-18 20:04:25 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2018-12-19 08:13:26 +0100 |
| commit | c85400f886e3d41e69966470879f635a2b50084c (patch) | |
| tree | c567f6146fb5ff13a0ed311085cf6ac622f7e189 /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | c710d0bb76ff0795d8b6c1cda1e01e6e1e661a4a (diff) | |
usb: r8a66597: Fix a possible concurrency use-after-free bug in r8a66597_endpoint_disable()
The function r8a66597_endpoint_disable() and r8a66597_urb_enqueue() may
be concurrently executed.
The two functions both access a possible shared variable "hep->hcpriv".
This shared variable is freed by r8a66597_endpoint_disable() via the
call path:
r8a66597_endpoint_disable
kfree(hep->hcpriv) (line 1995 in Linux-4.19)
This variable is read by r8a66597_urb_enqueue() via the call path:
r8a66597_urb_enqueue
spin_lock_irqsave(&r8a66597->lock)
init_pipe_info
enable_r8a66597_pipe
pipe = hep->hcpriv (line 802 in Linux-4.19)
The read operation is protected by a spinlock, but the free operation
is not protected by this spinlock, thus a concurrency use-after-free bug
may occur.
To fix this bug, the spin-lock and spin-unlock function calls in
r8a66597_endpoint_disable() are moved to protect the free operation.
Signed-off-by: Jia-Ju Bai <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions