drm/amdgpu: validate user pitch alignment (89f23b6e) · Commits · 戴 / test

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>

drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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) {

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