From: Jens Axboe <axboe@kernel.dk>
To: syzbot <syzbot+b9e83021d9c642a33d8c@syzkaller.appspotmail.com>,
io-uring@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [io-uring?] KASAN: slab-use-after-free Read in io_waitid_wait
Date: Tue, 7 Oct 2025 07:24:32 -0600 [thread overview]
Message-ID: <747c4bf7-49bb-478d-a8f1-c7092ceaaa81@kernel.dk> (raw)
In-Reply-To: <68e50af2.a00a0220.298cc0.0479.GAE@google.com>
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git master
diff --git a/io_uring/waitid.c b/io_uring/waitid.c
index 26c118f3918d..f25110fb1b12 100644
--- a/io_uring/waitid.c
+++ b/io_uring/waitid.c
@@ -230,13 +230,14 @@ static int io_waitid_wait(struct wait_queue_entry *wait, unsigned mode,
if (!pid_child_should_wake(wo, p))
return 0;
+ list_del_init(&wait->entry);
+
/* cancel is in progress */
if (atomic_fetch_inc(&iw->refs) & IO_WAITID_REF_MASK)
return 1;
req->io_task_work.func = io_waitid_cb;
io_req_task_work_add(req);
- list_del_init(&wait->entry);
return 1;
}
--
Jens Axboe
next prev parent reply other threads:[~2025-10-07 13:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-07 12:43 [syzbot] [io-uring?] KASAN: slab-use-after-free Read in io_waitid_wait syzbot
2025-10-07 13:20 ` Jens Axboe
2025-10-07 13:20 ` syzbot
2025-10-07 13:24 ` Jens Axboe [this message]
2025-10-07 13:45 ` syzbot
2025-10-09 16:56 ` Jens Axboe
2025-10-09 17:11 ` syzbot
2025-10-09 17:16 ` Jens Axboe
2025-10-09 17:36 ` syzbot
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