Commit b2e74db5 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring/net: don't overflow multishot recv 



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: b3fdea6e ("io_uring: multishot recv")
Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0b295634e8f1b71aa764c984608c22d85f88f75c.1691757663.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 1bfed233

io_uring/net.c

+1 −1
Original line number Diff line number Diff line
@@ -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, true)) {

			       *ret, cflags | IORING_CQE_F_MORE, false)) {

			io_recv_prep_retry(req);

			/* Known not-empty or unknown state, retry */

			if (cflags & IORING_CQE_F_SOCK_NONEMPTY ||