CVE-2022-49490

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/msm/mdp5: Return error code in mdp5_pipe_release when deadlock is detected<br /> <br /> mdp5_get_global_state runs the risk of hitting a -EDEADLK when acquiring<br /> the modeset lock, but currently mdp5_pipe_release doesn&amp;#39;t check for if<br /> an error is returned. Because of this, there is a possibility of<br /> mdp5_pipe_release hitting a NULL dereference error.<br /> <br /> To avoid this, let&amp;#39;s have mdp5_pipe_release check if<br /> mdp5_get_global_state returns an error and propogate that error.<br /> <br /> Changes since v1:<br /> - Separated declaration and initialization of *new_state to avoid<br /> compiler warning<br /> - Fixed some spelling mistakes in commit message<br /> <br /> Changes since v2:<br /> - Return 0 in case where hwpipe is NULL as this is considered normal<br /> behavior<br /> - Added 2nd patch in series to fix a similar NULL dereference issue in<br /> mdp5_mixer_release<br /> <br /> Patchwork: https://patchwork.freedesktop.org/patch/485179/