io_uring: hold 'ctx' reference around task_work queue + execute

commit 6d816e088c359866f9867057e04f244c608c42fe upstream.

We're holding the request reference, but we need to go one higher
to ensure that the ctx remains valid after the request has finished.
If the ring is closed with pending task_work inflight, and the
given io_kiocb finishes sync during issue, then we need a reference
to the ring itself around the task_work execution cycle.

Cc: stable@vger.kernel.org # v5.7+
Reported-by: syzbot+9b260fc33297966f5a8e@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e42c7583ee5ea9506f3af1a3bcceb647d119dca9..0918fae6270cbf083dedc95631f902b0e58e57a5 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4140,6 +4140,8 @@ static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
        tsk = req->task;
        req->result = mask;
        init_task_work(&req->task_work, func);
+       percpu_ref_get(&req->ctx->refs);
+
        /*
         * If this fails, then the task is exiting. When a task exits, the
         * work gets canceled, so just cancel this request as well instead
@@ -4239,6 +4241,7 @@ static void io_poll_task_handler(struct io_kiocb *req, struct io_kiocb **nxt)
 static void io_poll_task_func(struct callback_head *cb)
 {
        struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
+       struct io_ring_ctx *ctx = req->ctx;
        struct io_kiocb *nxt = NULL;
 
        io_poll_task_handler(req, &nxt);
@@ -4249,6 +4252,7 @@ static void io_poll_task_func(struct callback_head *cb)
                __io_queue_sqe(nxt, NULL);
                mutex_unlock(&ctx->uring_lock);
        }
+       percpu_ref_put(&ctx->refs);
 }
 
 static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode,
@@ -4365,6 +4369,7 @@ static void io_async_task_func(struct callback_head *cb)
 
        if (io_poll_rewait(req, &apoll->poll)) {
                spin_unlock_irq(&ctx->completion_lock);
+               percpu_ref_put(&ctx->refs);
                return;
        }
 
@@ -4402,6 +4407,7 @@ end_req:
                req_set_fail_links(req);
                io_double_put_req(req);
        }
+       percpu_ref_put(&ctx->refs);
 }
 
 static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync,