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Tue, 07 Oct 2025 06:24:32 -0700 (PDT) Message-ID: <747c4bf7-49bb-478d-a8f1-c7092ceaaa81@kernel.dk> Date: Tue, 7 Oct 2025 07:24:32 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Jens Axboe Subject: Re: [syzbot] [io-uring?] KASAN: slab-use-after-free Read in io_waitid_wait To: syzbot , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <68e50af2.a00a0220.298cc0.0479.GAE@google.com> Content-Language: en-US In-Reply-To: <68e50af2.a00a0220.298cc0.0479.GAE@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit #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