This is a note to let you know that I've just added the patch titled
io_uring: fix off-by one bvec index
to the 6.6-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-off-by-one-bvec-index.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d6fef34ee4d102be448146f24caf96d7b4a05401 Mon Sep 17 00:00:00 2001
From: Keith Busch <kbusch@xxxxxxxxxx>
Date: Mon, 20 Nov 2023 14:18:31 -0800
Subject: io_uring: fix off-by one bvec index
From: Keith Busch <kbusch@xxxxxxxxxx>
commit d6fef34ee4d102be448146f24caf96d7b4a05401 upstream.
If the offset equals the bv_len of the first registered bvec, then the
request does not include any of that first bvec. Skip it so that drivers
don't have to deal with a zero length bvec, which was observed to break
NVMe's PRP list creation.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: bd11b3a391e3 ("io_uring: don't use iov_iter_advance() for fixed buffers")
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231120221831.2646460-1-kbusch@xxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/rsrc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -1261,7 +1261,7 @@ int io_import_fixed(int ddir, struct iov
*/
const struct bio_vec *bvec = imu->bvec;
- if (offset <= bvec->bv_len) {
+ if (offset < bvec->bv_len) {
/*
* Note, huge pages buffers consists of one large
* bvec entry and should always go this way. The other
Patches currently in stable-queue which might be from kbusch@xxxxxxxxxx are
queue-6.6/swiotlb-xen-provide-the-max_mapping_size-method.patch
queue-6.6/nvme-blank-out-authentication-fabrics-options-if-not.patch
queue-6.6/io_uring-fix-off-by-one-bvec-index.patch
queue-6.6/nvmet-nul-terminate-the-nqns-passed-in-the-connect-c.patch
