Re: [PATCH 5.10.y] drm/cirrus: fix a NULL vs IS_ERR() checks

On Sun, Apr 24, 2022 at 11:27:17AM +0800, Shile Zhang wrote:

Hi David and Daniel,

Sorry but could you please help to check this issue? Due to the function 'drm_gem_shmem_vmap' could return ERROR pointers which will cause the kernel crash due to 'cirrus_fb_blit_rect' only check the pointer.

Since the related code has been refactoring in mainline, so this issue only happened in stable 5.10.y branch.

@Greg I think it is probably not realistic to backport the related refactoring from mainline directly, so I just give this bugfix patch only for 5.10.y branch.

I'm sorry, but I do not have "this bugfix" in my queue anymore, considering it is so old. Please rebase and resubmit.

thanks,

greg k-h