The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x d6fef34ee4d102be448146f24caf96d7b4a05401 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023113025-wrist-mummify-38c1@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

d6fef34ee4d1 ("io_uring: fix off-by one bvec index") 57bebf807e2a ("io_uring/rsrc: optimise registered huge pages") b000ae0ec2d7 ("io_uring/rsrc: optimise single entry advance") c059f7858408 ("io_uring: move io_import_fixed()") f337a84d3952 ("io_uring: opcode independent fixed buf import") f3b44f92e59a ("io_uring: move read/write related opcodes to its own file") c98817e6cd44 ("io_uring: move remaining file table manipulation to filetable.c") 735729844819 ("io_uring: move rsrc related data, core, and commands") 3b77495a9723 ("io_uring: split provided buffers handling into its own file") 7aaff708a768 ("io_uring: move cancelation into its own file") 329061d3e2f9 ("io_uring: move poll handling into its own file") cfd22e6b3319 ("io_uring: add opcode name to io_op_defs") 92ac8beaea1f ("io_uring: include and forward-declaration sanitation") c9f06aa7de15 ("io_uring: move io_uring_task (tctx) helpers into its own file") a4ad4f748ea9 ("io_uring: move fdinfo helpers to its own file") e5550a1447bf ("io_uring: use io_is_uring_fops() consistently") 17437f311490 ("io_uring: move SQPOLL related handling into its own file") 59915143e89f ("io_uring: move timeout opcodes and handling into its own file") e418bbc97bff ("io_uring: move our reference counting into a header") 36404b09aa60 ("io_uring: move msg_ring into its own file")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d6fef34ee4d102be448146f24caf96d7b4a05401 Mon Sep 17 00:00:00 2001 From: Keith Busch kbusch@kernel.org Date: Mon, 20 Nov 2023 14:18:31 -0800 Subject: [PATCH] io_uring: fix off-by one bvec index

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@vger.kernel.org Fixes: bd11b3a391e3 ("io_uring: don't use iov_iter_advance() for fixed buffers") Signed-off-by: Keith Busch kbusch@kernel.org Link: https://lore.kernel.org/r/20231120221831.2646460-1-kbusch@meta.com Signed-off-by: Jens Axboe axboe@kernel.dk

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 7034be555334..f521c5965a93 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -1258,7 +1258,7 @@ int io_import_fixed(int ddir, struct iov_iter *iter, */ 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