From 99f304beb82a86713dc4bc1fd65b8dfda25b1f5e Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 8 Jun 2019 12:23:57 +0300 Subject: 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 Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers') 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)); } -- cgit