On Thu, Jan 03, 2019 at 05:33:19PM +0100, Michel Dänzer wrote:
On 2018-12-30 2:00 a.m., Yu Zhao wrote:
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+ Signed-off-by: Yu Zhao yuzhao@google.com
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c index 15ce7e681d67..16af80ccd0a0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c @@ -527,6 +527,22 @@ 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;
- if (pitch < mode_cmd->width) {
DRM_DEBUG_KMS("Expecting pitch(%d)/cpp(%d) >= width(%d)\n",mode_cmd->pitches[0], cpp, mode_cmd->width);return ERR_PTR(-EINVAL);- }
This should possibly be tested in drm_internal_framebuffer_create instead.
It seems to me drm_format_info_min_pitch() in framebuffer_check() already does it. We could just remove the check here?