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authorSusant Sahani <susant@redhat.com>2014-05-09 22:41:32 +0400
committerDavid S. Miller <davem@davemloft.net>2014-05-13 08:27:19 +0400
commitc8965932a2e3b70197ec02c6741c29460279e2a8 (patch)
tree6fc84b84873ecf41026975b784375ffc92cf753f /net
parent1c3639005f48492e5f2d965779efd814e80f8b15 (diff)
downloadlinux-c8965932a2e3b70197ec02c6741c29460279e2a8.tar.xz
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@redhat.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ip6_tunnel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index b05b609f69d1..f6a66bb4114d 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]);