diff options
| author | Yu Zhao <yuzhao@google.com> | 2019-01-07 15:51:14 -0700 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-01-08 16:26:41 -0500 |
| commit | 89f23b6efef554766177bf51aa754bce14c3e7da (patch) | |
| tree | 8558916273a97a04eed4c98ada96a5bbd9138777 /drivers/gpu | |
| parent | fadcb8f9fc89f7b517ce48f30e0b607b16d99d63 (diff) | |
drm/amdgpu: validate user pitch alignment
Userspace may request pitch alignment that is not supported by GPU.
Some requests 32, but GPU ignores it and uses default 64 when cpp is
4. If GEM object is allocated based on the smaller alignment, GPU
DMA will go out of bound.
Cc: stable@vger.kernel.org # v4.2+
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c index b083b219b1a9..cb72d9675ab1 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c @@ -531,6 +531,16 @@ amdgpu_display_user_framebuffer_create(struct drm_device *dev, struct drm_gem_object *obj; struct amdgpu_framebuffer *amdgpu_fb; int ret; + struct amdgpu_device *adev = dev->dev_private; + int cpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0); + int pitch = mode_cmd->pitches[0] / cpp; + + pitch = amdgpu_align_pitch(adev, pitch, cpp, false); + if (mode_cmd->pitches[0] != pitch) { + DRM_DEBUG_KMS("Invalid pitch: expecting %d but got %d\n", + pitch, mode_cmd->pitches[0]); + return ERR_PTR(-EINVAL); + } obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[0]); if (obj == NULL) { |