From 990a4de57e44f4f4cfc33c90d2ec5d285b7c8342 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 19 Dec 2022 07:28:26 -0700 Subject: io_uring/net: ensure compat import handlers clear free_iov If we're not allocating the vectors because the count is below UIO_FASTIOV, we still do need to properly clear ->free_iov to prevent an erronous free of on-stack data. Reported-by: Jiri Slaby Fixes: 4c17a496a7a0 ("io_uring/net: fix cleanup double free free_iov init") Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe --- io_uring/net.c | 1 + 1 file changed, 1 insertion(+) (limited to 'io_uring') diff --git a/io_uring/net.c b/io_uring/net.c index 5229976cb582..f76b688f476e 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -494,6 +494,7 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, if (req->flags & REQ_F_BUFFER_SELECT) { compat_ssize_t clen; + iomsg->free_iov = NULL; if (msg.msg_iovlen == 0) { sr->len = 0; } else if (msg.msg_iovlen > 1) { -- cgit v1.2.3