On 13/06/2024 21:17, Geert Uytterhoeven wrote:
No implementations of drm_plane_helper_funcs.get_scanout_buffer() fill in the optional drm_scanout_buffer.set_pixel() member. Hence the member may contain non-zero garbage, causing a crash when deferencing it during drm panic. Fix this by pre-initializing the drm_scanout_buffer object before calling drm_plane_helper_funcs.get_scanout_buffer().
Good catch, I don't know how I didn't hit this bug before. Thanks for the fix. Reviewed-by: Jocelyn Falempe <jfale...@redhat.com>
Fixes: 24d07f114e4ec760 ("drm/panic: Add a set_pixel() callback to drm_scanout_buffer") Signed-off-by: Geert Uytterhoeven <geert+rene...@glider.be> --- v2: - New. --- drivers/gpu/drm/drm_panic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c index 293d4dcbc80da7ba..fc04ed4e0b399f55 100644 --- a/drivers/gpu/drm/drm_panic.c +++ b/drivers/gpu/drm/drm_panic.c @@ -582,7 +582,7 @@ static void draw_panic_dispatch(struct drm_scanout_buffer *sb)static void draw_panic_plane(struct drm_plane *plane){ - struct drm_scanout_buffer sb; + struct drm_scanout_buffer sb = { }; int ret; unsigned long flags;
