Re: [PATCH v2] io_uring: fix filename leak in __io_openat_prep()

[Jens Axboe <axboe@kernel.dk>]

On 12/25/25 12:28 AM, Prithvi Tambewagh wrote:
>  __io_openat_prep() allocates a struct filename using getname(). However,
> for the condition of the file being installed in the fixed file table as
> well as having O_CLOEXEC flag set, the function returns early. At that
> point, the request doesn't have REQ_F_NEED_CLEANUP flag set. Due to this,
> the memory for the newly allocated struct filename is not cleaned up,
> causing a memory leak.
> 
> Fix this by setting the REQ_F_NEED_CLEANUP for the request just after the
> successful getname() call, so that when the request is torn down, the
> filename will be cleaned up, along with other resources needing cleanup.
> 
> Reported-by: syzbot+00e61c43eb5e4740438f@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=00e61c43eb5e4740438f
> Tested-by: syzbot+00e61c43eb5e4740438f@syzkaller.appspotmail.com
> Cc: stable@vger.kernel.org
> Signed-off-by: Prithvi Tambewagh <activprithvi@gmail.com>

Thanks, just missing a:

Fixes: b9445598d8c6 ("io_uring: openat directly into fixed fd table")

which I'll add when applying.

-- 
Jens Axboe