This is a note to let you know that I've just added the patch titled
io_uring/rw: ensure io->bytes_done is always initialized
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-rw-ensure-io-bytes_done-is-always-initialized.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.
>From 2fb96ecf68bc1fb55508d22ebaf9518eaeb1a088 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Mon, 22 Jan 2024 12:30:07 -0700
Subject: io_uring/rw: ensure io->bytes_done is always initialized
From: Jens Axboe <axboe@xxxxxxxxx>
commit 0a535eddbe0dc1de4386046ab849f08aeb2f8faf upstream.
If IOSQE_ASYNC is set and we fail importing an iovec for a readv or
writev request, then we leave ->bytes_done uninitialized and hence the
eventual failure CQE posted can potentially have a random res value
rather than the expected -EINVAL.
Setup ->bytes_done before potentially failing, so we have a consistent
value if we fail the request early.
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: xingwei lee <xrivendell7@xxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/io_uring.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3485,14 +3485,17 @@ static inline int io_rw_prep_async(struc
struct iovec *iov = iorw->fast_iov;
int ret;
+ iorw->bytes_done = 0;
+ iorw->free_iovec = NULL;
+
ret = io_import_iovec(rw, req, &iov, &iorw->iter, false);
if (unlikely(ret < 0))
return ret;
- iorw->bytes_done = 0;
- iorw->free_iovec = iov;
- if (iov)
+ if (iov) {
+ iorw->free_iovec = iov;
req->flags |= REQ_F_NEED_CLEANUP;
+ }
iov_iter_save_state(&iorw->iter, &iorw->iter_state);
return 0;
}
Patches currently in stable-queue which might be from axboe@xxxxxxxxx are
queue-5.10/io_uring-rw-ensure-io-bytes_done-is-always-initialized.patch
queue-5.10/nvme-core-check-for-too-small-lba-shift.patch
