Quoting Eric Biggers (2019-02-26 22:08:58)
> From: Eric Biggers <ebigg...@google.com>
>
> If drm_gem_handle_create() fails in vkms_gem_create(), then the
> vkms_gem_object is freed twice: once when the reference is dropped by
> drm_gem_object_put_unlocked(), and again by the extra calls to
> drm_gem_object_release() and kfree().
>
> Fix it by skipping the second release and free.
>
> This bug was originally found in the vgem driver by syzkaller using
> fault injection, but I noticed it's also present in the vkms driver.
>
> Fixes: 559e50fd34d1 ("drm/vkms: Add dumb operations")
> Cc: Rodrigo Siqueira <rodrigosiqueiram...@gmail.com>
> Cc: Haneen Mohammed <hamohammed...@gmail.com>
> Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: sta...@vger.kernel.org
> Signed-off-by: Eric Biggers <ebigg...@google.com>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
-Chris
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