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drm/amdgpu: Fix bounds checking in amdgpu_ras_is_supported()

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The "block" variable can be set by the user through debugfs, so it can
be quite large which leads to shift wrapping here.  This means we report
a "block" as supported when it's not, and that leads to array overflows
later on.

This bug is not really a security issue in real life, because debugfs is
generally root only.

Fixes: 36ea1bd2d0 ("drm/amdgpu: add debugfs ctrl node")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2019-06-08 12:23:57 +03:00 committed by Alex Deucher
parent 9c5ab937b1
commit 8252562d52
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
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@ -173,6 +173,8 @@ static inline int amdgpu_ras_is_supported(struct amdgpu_device *adev,
{
struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
if (block >= AMDGPU_RAS_BLOCK_COUNT)
return 0;
return ras && (ras->supported & (1 << block));
}