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 280e5881880b90ee2bab9623c5a7a88d26d5c8e3..b33d4a97a8774df3769264d0e1315339c81a27b0 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4214,6 +4214,8 @@ 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
@@ -4313,6 +4315,7 @@ 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);
@@ -4323,6 +4326,7 @@ 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,
@@ -4439,6 +4443,7 @@ 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;
        }
 
@@ -4476,6 +4481,7 @@ end_req:
 
        kfree(apoll->double_poll);
        kfree(apoll);
+       percpu_ref_put(&ctx->refs);
 }
 
 static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync,