Re: [PATCH] block: fix syzbot report UAF in bdev_free_inode()

[Tetsuo Handa]

On 2021/10/09 15:59, Zqiang wrote:
> The xa_insert() may be return error in __alloc_disk_node(), and the disk
> object will be release, however there are two operations that will release
> it, kfree(disk) and iput(disk->part0->bd_inode), the iput operations
> will call call_rcu(), because the rcu callback executed is an asynchronous
> actionthe, so when free disk object in rcu callback, the disk object haven
> been released. solve it through a unified release action.
> 
> Reported-by: syzbot+8281086e8a6fbfbd952a@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Zqiang <qiang.zhang1211@xxxxxxxxx>

Thanks. But my patch is ready for 5.15.

https://lore.kernel.org/all/e6dd13c5-8db0-4392-6e78-a42ee5d2a1c4@xxxxxxxxxxxxxxxxxxx/T/#u