linux-kernel - [PATCH] Smack: fix dereferenced before check

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Date:   Thu, 21 Dec 2017 16:57:52 +0100
From:   Vasyl Gomonovych <gomonovych@...il.com>
To:     casey@...aufler-ca.com, james.l.morris@...cle.com,
        serge@...lyn.com, linux-security-module@...r.kernel.org,
        gomonovych@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] Smack: fix dereferenced before check

This patch fixes the warning reported by smatch:
security/smack/smack_lsm.c:2872 smack_socket_connect() warn:
variable dereferenced before check 'sock->sk' (see line 2869)

Signed-off-by: Vasyl Gomonovych <gomonovych@...il.com>
---
 security/smack/smack_lsm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 14cc7940b36d..30f2c3d1c11c 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -2866,12 +2866,16 @@ static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
 #endif
 #ifdef SMACK_IPV6_SECMARK_LABELING
 	struct smack_known *rsp;
-	struct socket_smack *ssp = sock->sk->sk_security;
+	struct socket_smack *ssp;
 #endif
 
 	if (sock->sk == NULL)
 		return 0;
 
+#ifdef SMACK_IPV6_SECMARK_LABELING
+	ssp = sock->sk->sk_security;
+#endif
+
 	switch (sock->sk->sk_family) {
 	case PF_INET:
 		if (addrlen < sizeof(struct sockaddr_in))
-- 
1.9.1