Commit c8965932 authored May 10, 2014 by Susant Sahani Committed by David S. Miller May 13, 2014

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>

parent 1c363900

net/ipv6/ip6_tunnel.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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]);

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