[PATCH] fs: erofs: add sanity check for kobject in erofs_unregister_sysfs

[Chao Yu]

On 2022/3/15 21:28, Dongliang Mu wrote:
> From: Dongliang Mu <mudongliangabcd at gmail.com>
> 
> Syzkaller hit 'WARNING: kobject bug in erofs_unregister_sysfs'. This bug
> is triggered by injecting fault in kobject_init_and_add of
> erofs_unregister_sysfs.
> 
> Fix this by adding sanity check for kobject in erofs_unregister_sysfs
> 
> Note that I've tested the patch and the crash does not occur any more.
> 
> Signed-off-by: Dongliang Mu <mudongliangabcd at gmail.com>

Reviewed-by: Chao Yu <chao at kernel.org>

Thanks,