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io_uring/net: don't overflow multishot recv
author
Pavel Begunkov
<asml.silence@gmail.com>
Fri, 11 Aug 2023 12:53:42 +0000
(13:53 +0100)
committer
Jens Axboe
<axboe@kernel.dk>
Fri, 11 Aug 2023 16:42:51 +0000
(10:42 -0600)
Don't allow overflowing multishot recv CQEs, it might get out of
hand, hurt performance, and in the worst case scenario OOM the task.
Cc: stable@vger.kernel.org
Fixes:
b3fdea6ecb55c
("io_uring: multishot recv")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link:
https://lore.kernel.org/r/0b295634e8f1b71aa764c984608c22d85f88f75c.1691757663.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_uring/net.c
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diff --git
a/io_uring/net.c
b/io_uring/net.c
index
1599493
..
8c419c0
100644
(file)
--- a/
io_uring/net.c
+++ b/
io_uring/net.c
@@
-642,7
+642,7
@@
static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
if (!mshot_finished) {
if (io_aux_cqe(req, issue_flags & IO_URING_F_COMPLETE_DEFER,
- *ret, cflags | IORING_CQE_F_MORE,
tru
e)) {
+ *ret, cflags | IORING_CQE_F_MORE,
fals
e)) {
io_recv_prep_retry(req);
/* Known not-empty or unknown state, retry */
if (cflags & IORING_CQE_F_SOCK_NONEMPTY ||