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>
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@ -1557,7 +1557,7 @@ static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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{
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u8 proto;
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u8 proto;
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if (!data)
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if (!data || !data[IFLA_IPTUN_PROTO])
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return 0;
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return 0;
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proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
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proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
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