linux-kernel - [PATCH] ipv4: fix error path in fou

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Date:   Sun,  8 Aug 2021 12:21:57 +0900
From:   Kangmin Park <l4stpr0gr4m@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ipv4: fix error path in fou_create()

kzalloc() to allocate fou is never called when udp_sock_create()
is failed. So, fou is always NULL in error label in this case.

Therefore, add a error_sock label and goto this label when
udp_sock_screate() is failed.

Signed-off-by: Kangmin Park <l4stpr0gr4m@...il.com>
---
 net/ipv4/fou.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index e5f69b0bf3df..60d67ae76880 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -572,7 +572,7 @@ 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);
@@ -627,9 +627,9 @@ static int fou_create(struct net *net, struct fou_cfg *cfg,
 
 error:
 	kfree(fou);
+error_sock:
 	if (sock)
 		udp_tunnel_sock_release(sock);
-
 	return err;
 }
 
-- 
2.26.2