netdev - [PATCH 1/5] io_uring: Fix leak of async data when connect prep fails

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Message-ID: <20240531211211.12628-2-krisman@suse.de>
Date: Fri, 31 May 2024 17:12:07 -0400
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: axboe@...nel.dk
Cc: io-uring@...r.kernel.org,
	netdev@...r.kernel.org,
	Gabriel Krisman Bertazi <krisman@...e.de>
Subject: [PATCH 1/5] io_uring: Fix leak of async data when connect prep fails

move_addr_to_kernel can fail, like if the user provides a bad sockaddr
pointer. In this case where the failure happens on ->prep() we don't
have a chance to clean the request later, so handle it here.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...e.de>
---
 io_uring/net.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/io_uring/net.c b/io_uring/net.c
index 0a48596429d9..c3377e70aeeb 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1657,6 +1657,7 @@ int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
 	struct io_async_msghdr *io;
+	int ret;
 
 	if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
 		return -EINVAL;
@@ -1669,7 +1670,10 @@ int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (unlikely(!io))
 		return -ENOMEM;
 
-	return move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
+	ret = move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
+	if (ret)
+		io_netmsg_recycle(req, 0);
+	return ret;
 }
 
 int io_connect(struct io_kiocb *req, unsigned int issue_flags)
-- 
2.44.0