6.5-stable review patch. If anyone has any objections, please let me know.
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From: Pavel Begunkov asml.silence@gmail.com
commit b2e74db55dd93d6db22a813c9a775b5dbf87c560 upstream.
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.169175766... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/io_uring/net.c +++ b/io_uring/net.c @@ -642,7 +642,7 @@ static inline bool io_recv_finish(struct
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 ||