From 98aada6e22786916d150a598c7a7eaf937ca464c Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Sun, 16 Oct 2022 22:42:58 +0100 Subject: [PATCH] io_uring/rw: fix unexpected link breakage [ upstream commit bf68b5b34311ee57ed40749a1257a30b46127556 ] req->cqe.res is set in io_read() to the amount of bytes left to be done, which is used to figure out whether to fail a read or not. However, io_read() may do another without returning, and we stash the previous value into ->bytes_done but forget to update cqe.res. Then we ask a read to do strictly less than cqe.res but expect the return to be exactly cqe.res. Fix the bug by updating cqe.res for retries. Cc: stable@vger.kernel.org Reported-and-Tested-by: Beld Zhang Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/3a1088440c7be98e5800267af922a67da0ef9f13.1664235732.git.asml.silence@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- fs/io_uring.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index 589e9e122e5d..b8ae64df90e3 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3606,6 +3606,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) return -EAGAIN; } + req->result = iov_iter_count(iter); /* * Now retry read with the IOCB_WAITQ parts set in the iocb. If * we get -EIOCBQUEUED, then we'll get a notification when the