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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-06-08 12:23:57 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-06-13 04:39:48 +0300 |
| commit | 99f304beb82a86713dc4bc1fd65b8dfda25b1f5e (patch) | |
| tree | ac015e389c4cc3d91bf0d4efcb57ac41f69f3d55 | |
| parent | 517b91f4cde3043d77b2178548473e8545ef07cb (diff) | |
| download | linux-99f304beb82a86713dc4bc1fd65b8dfda25b1f5e.tar.xz | |
drm/amdgpu: Fix bounds checking in amdgpu_ras_is_supported()
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: 36ea1bd2d084 ("drm/amdgpu: add debugfs ctrl node")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h index eaef5edefc34..24c6e5fcda86 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h @@ -172,6 +172,8 @@ 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)); } |