Quoting Eric Biggers (2019-02-26 22:08:58)
> From: Eric Biggers <[email protected]>
>
> 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 <[email protected]>
> Cc: Haneen Mohammed <[email protected]>
> Cc: Daniel Vetter <[email protected]>
> Cc: Chris Wilson <[email protected]>
> Cc: [email protected]
> Signed-off-by: Eric Biggers <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
-Chris
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