From: Pavel Begunkov Date: Sat, 10 Jul 2021 01:45:59 +0000 (+0100) Subject: io_uring: use right task for exiting checks X-Git-Tag: v5.12.19~268 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9dac3c1ab15521e5eec262fe6727e03035dadef7;p=thirdparty%2Fkernel%2Fstable.git io_uring: use right task for exiting checks commit 9c6882608bce249a8918744ecdb65748534e3f17 upstream. When we use delayed_work for fallback execution of requests, current will be not of the submitter task, and so checks in io_req_task_submit() may not behave as expected. Currently, it leaves inline completions not flushed, so making io_ring_exit_work() to hang. Use the submitter task for all those checks. Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/cb413c715bed0bc9c98b169059ea9c8a2c770715.1625881431.git.asml.silence@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/io_uring.c b/fs/io_uring.c index 58ac04cca587f..5f15d6fde103e 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2023,7 +2023,7 @@ static void __io_req_task_submit(struct io_kiocb *req) /* ctx stays valid until unlock, even if we drop all ours ctx->refs */ mutex_lock(&ctx->uring_lock); - if (!(current->flags & PF_EXITING) && !current->in_execve) + if (!(req->task->flags & PF_EXITING) && !req->task->in_execve) __io_queue_sqe(req); else __io_req_task_cancel(req, -EFAULT);