Patch "io_uring: fix timeout cancel return code" has been added to the 5.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    io_uring: fix timeout cancel return code

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     io_uring-fix-timeout-cancel-return-code.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f611e07e137073775b90112bdaff60d94966004b
Author: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date:   Thu Mar 25 18:32:42 2021 +0000

    io_uring: fix timeout cancel return code
    
    [ Upstream commit 1ee4160c73b2102a52bc97a4128a89c34821414f ]
    
    When we cancel a timeout we should emit a sensible return code, like
    -ECANCELED but not 0, otherwise it may trick users.
    
    Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
    Link: https://lore.kernel.org/r/7b0ad1065e3bd1994722702bd0ba9e7bc9b0683b.1616696997.git.asml.silence@xxxxxxxxx
    Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4ccf99cb8cdc..0de27e75460d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1489,7 +1489,7 @@ static void io_queue_async_work(struct io_kiocb *req)
 		io_queue_linked_timeout(link);
 }
 
-static void io_kill_timeout(struct io_kiocb *req)
+static void io_kill_timeout(struct io_kiocb *req, int status)
 {
 	struct io_timeout_data *io = req->async_data;
 	int ret;
@@ -1499,7 +1499,7 @@ static void io_kill_timeout(struct io_kiocb *req)
 		atomic_set(&req->ctx->cq_timeouts,
 			atomic_read(&req->ctx->cq_timeouts) + 1);
 		list_del_init(&req->timeout.list);
-		io_cqring_fill_event(req, 0);
+		io_cqring_fill_event(req, status);
 		io_put_req_deferred(req, 1);
 	}
 }
@@ -1516,7 +1516,7 @@ static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
 	spin_lock_irq(&ctx->completion_lock);
 	list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
 		if (io_match_task(req, tsk, files)) {
-			io_kill_timeout(req);
+			io_kill_timeout(req, -ECANCELED);
 			canceled++;
 		}
 	}
@@ -1568,7 +1568,7 @@ static void io_flush_timeouts(struct io_ring_ctx *ctx)
 			break;
 
 		list_del_init(&req->timeout.list);
-		io_kill_timeout(req);
+		io_kill_timeout(req, 0);
 	} while (!list_empty(&ctx->timeout_list));
 
 	ctx->cq_last_tm_flush = seq;