[PATCH v3 net] ipv4: fix error path in fou_create()

From: Kangmin Park <l4stpr0gr4m@gmail.com>
To: "David S. Miller" <davem@davemloft.net>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	David Ahern <dsahern@kernel.org>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 net] ipv4: fix error path in fou_create()
Date: Sun,  8 Aug 2021 16:05:57 +0900	[thread overview]
Message-ID: <20210808070557.17858-1-l4stpr0gr4m@gmail.com> (raw)

sock is always NULL when udp_sock_create() is failed and fou is
always NULL when kzalloc() is failed in error label.

So, add error_sock and error_alloc label and fix the error path
in those cases.

Signed-off-by: Kangmin Park <l4stpr0gr4m@gmail.com>
---
v3:
 - change commit message
 - fix error path
---
 net/ipv4/fou.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index e5f69b0bf3df..f1d99e776bb8 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -572,13 +572,13 @@ static int fou_create(struct net *net, struct fou_cfg *cfg,
 	/* Open UDP socket */
 	err = udp_sock_create(net, &cfg->udp_config, &sock);
 	if (err < 0)
-		goto error;
+		goto error_sock;
 
 	/* Allocate FOU port structure */
 	fou = kzalloc(sizeof(*fou), GFP_KERNEL);
 	if (!fou) {
 		err = -ENOMEM;
-		goto error;
+		goto error_alloc;
 	}
 
 	sk = sock->sk;
@@ -627,9 +627,10 @@ static int fou_create(struct net *net, struct fou_cfg *cfg,
 
 error:
 	kfree(fou);
+error_alloc:
 	if (sock)
 		udp_tunnel_sock_release(sock);
-
+error_sock:
 	return err;
 }
 
-- 
2.26.2

