diff options
| author | Dan Carpenter <[email protected]> | 2017-10-25 11:04:47 +0100 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-10-25 12:10:59 +0200 |
| commit | 092e72c9edab16d4d6ad10c683a95047d53b6db4 (patch) | |
| tree | 83b287433e6af410d15432ba9466ca7dc70d01e6 | |
| parent | f34157878d3b17641ad2366988600c23c89d98b2 (diff) | |
efi/efi_test: Prevent an Oops in efi_runtime_query_capsulecaps()
If "qcaps.capsule_count" is ULONG_MAX then "qcaps.capsule_count + 1"
will overflow to zero and kcalloc() will return the ZERO_SIZE_PTR. We
try to dereference it inside the loop and crash.
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Acked-by: Ivan Hu <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Fixes: ff6301dabc3c ("efi: Add efi_test driver for exporting UEFI runtime service interfaces")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | drivers/firmware/efi/test/efi_test.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/firmware/efi/test/efi_test.c b/drivers/firmware/efi/test/efi_test.c index 08129b7b80ab..41c48a1e8baa 100644 --- a/drivers/firmware/efi/test/efi_test.c +++ b/drivers/firmware/efi/test/efi_test.c @@ -593,6 +593,9 @@ static long efi_runtime_query_capsulecaps(unsigned long arg) if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps))) return -EFAULT; + if (qcaps.capsule_count == ULONG_MAX) + return -EINVAL; + capsules = kcalloc(qcaps.capsule_count + 1, sizeof(efi_capsule_header_t), GFP_KERNEL); if (!capsules) |