This is a note to let you know that I've just added the patch titled
io_uring: correct pinned_vm accounting
to the 5.19-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-correct-pinned_vm-accounting.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 42b6419d0aba47c5d8644cdc0b68502254671de5 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date: Tue, 4 Oct 2022 03:19:08 +0100
Subject: io_uring: correct pinned_vm accounting
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
commit 42b6419d0aba47c5d8644cdc0b68502254671de5 upstream.
->mm_account should be released only after we free all registered
buffers, otherwise __io_sqe_buffers_unregister() will see a NULL
->mm_account and skip locked_vm accounting.
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Link: https://lore.kernel.org/r/6d798f65ed4ab8db3664c4d3397d4af16ca98846.1664849932.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/io_uring.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -10727,12 +10727,6 @@ static void io_flush_apoll_cache(struct
static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
{
io_sq_thread_finish(ctx);
-
- if (ctx->mm_account) {
- mmdrop(ctx->mm_account);
- ctx->mm_account = NULL;
- }
-
io_rsrc_refs_drop(ctx);
/* __io_rsrc_put_work() may need uring_lock to progress, wait w/o it */
io_wait_rsrc_data(ctx->buf_data);
@@ -10771,6 +10765,10 @@ static __cold void io_ring_ctx_free(stru
#endif
WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
+ if (ctx->mm_account) {
+ mmdrop(ctx->mm_account);
+ ctx->mm_account = NULL;
+ }
io_mem_free(ctx->rings);
io_mem_free(ctx->sq_sqes);
Patches currently in stable-queue which might be from asml.silence@xxxxxxxxx are
queue-5.19/io_uring-correct-pinned_vm-accounting.patch
queue-5.19/io_uring-net-don-t-update-msg_name-if-not-provided.patch
queue-5.19/io_uring-rw-fix-unexpected-link-breakage.patch
queue-5.19/io_uring-net-fix-fast_iov-assignment-in-io_setup_async_msg.patch
queue-5.19/io_uring-af_unix-defer-registered-files-gc-to-io_uring-release.patch
