linux-kernel - [PATCH net] net/9p: Fix a potential socket leak in p9_socket

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Date:   Thu, 24 Nov 2022 16:10:05 +0800
From:   Wang Hai <wanghai38@...wei.com>
To:     <ericvh@...il.com>, <lucho@...kov.net>, <asmadeus@...ewreck.org>,
        <linux_oss@...debyte.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <viro@...iv.linux.org.uk>
CC:     <v9fs-developer@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: [PATCH net] net/9p: Fix a potential socket leak in p9_socket_open

Both p9_fd_create_tcp() and p9_fd_create_unix() will call
p9_socket_open(). If the creation of p9_trans_fd fails,
p9_fd_create_tcp() and p9_fd_create_unix() will return an
error directly instead of releasing the cscoket, which will
result in a socket leak.

This patch adds sock_release() to fix the leak issue.

Fixes: 6b18662e239a ("9p connect fixes")
Signed-off-by: Wang Hai <wanghai38@...wei.com>
---
 net/9p/trans_fd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 56a186768750..f834726d21ea 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -860,8 +860,10 @@ static int p9_socket_open(struct p9_client *client, struct socket *csocket)
 	struct file *file;
 
 	p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
-	if (!p)
+	if (!p) {
+		sock_release(csocket);
 		return -ENOMEM;
+	}
 
 	csocket->sk->sk_allocation = GFP_NOIO;
 	file = sock_alloc_file(csocket, 0, NULL);
-- 
2.17.1