netdev - [PATCH] ip6_tunnel: fix potential NULL pointer dereference

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Message-Id: <1399660892-19008-1-git-send-email-susant@redhat.com>
Date:	Sat, 10 May 2014 00:11:32 +0530
From:	Susant Sahani <susant@...hat.com>
To:	netdev@...r.kernel.org
Cc:	tgraf@...g.ch
Subject: [PATCH] ip6_tunnel: fix potential NULL pointer dereference

The function ip6_tnl_validate assumes that the rtnl
attribute IFLA_IPTUN_PROTO always be filled . If this
attribute is not filled by  the userspace application
kernel get crashed with NULL pointer dereference. This
patch fixes the potential kernel crash when
IFLA_IPTUN_PROTO is missing .

Signed-off-by: Susant Sahani <susant@...hat.com>
Acked-by: Thomas Graf <tgraf@...g.ch>
---
 net/ipv6/ip6_tunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index b05b609..f6a66bb 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1557,7 +1557,7 @@ static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
 {
 	u8 proto;
 
-	if (!data)
+	if (!data || !data[IFLA_IPTUN_PROTO])
 		return 0;
 
 	proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
-- 
1.8.3.1

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