netdev - [PATCH net-next] sctp: check dst 'NULL' before use it in, sctp_packet

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <52BA8DA2.6030405@huawei.com>
Date:	Wed, 25 Dec 2013 15:47:46 +0800
From:	Wang Weidong <wangweidong1@...wei.com>
To:	Neil Horman <nhorman@...driver.com>,
	Vlad Yasevich <vyasevich@...il.com>,
	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>
Subject: [PATCH net-next] sctp: check dst 'NULL' before use it in, sctp_packet_transmit

skb_dst_set will use dst, if dst is NULL although is not a problem,
then goto the no_route and free nskb, so do the skb_dst_set is pointless.
so check dst before use it. Remove the unnecessary initialization as well.

Signed-off-by: Wang Weidong <wangweidong1@...wei.com>
---
 net/sctp/output.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sctp/output.c b/net/sctp/output.c
index 3be70a4..9b76d62 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -387,7 +387,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 	int err = 0;
 	int padding;		/* How much padding do we need?  */
 	__u8 has_data = 0;
-	struct dst_entry *dst = tp->dst;
+	struct dst_entry *dst;
 	unsigned char *auth = NULL;	/* pointer to auth in skb data */
 
 	pr_debug("%s: packet:%p\n", __func__, packet);
@@ -420,9 +420,9 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 		}
 	}
 	dst = dst_clone(tp->dst);
-	skb_dst_set(nskb, dst);
 	if (!dst)
 		goto no_route;
+	skb_dst_set(nskb, dst);
 
 	/* Build the SCTP header.  */
 	sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));
-- 
1.7.12


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html