From: Jens Axboe <axboe@kernel.dk>
To: Pavel Begunkov <asml.silence@gmail.com>, io-uring@vger.kernel.org
Cc: syzbot+edfd15cd4246a3fc615a@syzkaller.appspotmail.com
Subject: Re: [PATCH for-next 1/1] io_uring/net: fix cleanup double free free_iov init
Date: Mon, 26 Sep 2022 08:37:18 -0600 [thread overview]
Message-ID: <a14671e9-4963-21db-3b48-1d4cb2130e65@kernel.dk> (raw)
In-Reply-To: <f159b763c92ef80496ee6e33457b460f41d88651.1664199279.git.asml.silence@gmail.com>
On 9/26/22 7:35 AM, Pavel Begunkov wrote:
> Having ->async_data doesn't mean it's initialised and previously we vere
> relying on setting F_CLEANUP at the right moment. With zc sendmsg
> though, we set F_CLEANUP early in prep when we alloc a notif and so we
> may allocate async_data, fail in copy_msg_hdr() leaving
> struct io_async_msghdr not initialised correctly but with F_CLEANUP
> set, which causes a ->free_iov double free and probably other nastiness.
>
> Always initialise ->free_iov. Also, now it might point to fast_iov when
> fails, so avoid freeing it during cleanups.
APplied, thanks.
--
Jens Axboe
next prev parent reply other threads:[~2022-09-26 15:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-26 13:35 [PATCH for-next 1/1] io_uring/net: fix cleanup double free free_iov init Pavel Begunkov
2022-09-26 14:37 ` Jens Axboe [this message]
2022-12-19 10:23 ` User-triggerable 6.1 crash [was: io_uring/net: fix cleanup double free free_iov init] Jiri Slaby
2022-12-19 12:32 ` Jiri Slaby
2022-12-19 13:42 ` Pavel Begunkov
2022-12-19 13:41 ` Jens Axboe
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