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Commit c8965932 authored by Susant Sahani's avatar Susant Sahani Committed by David S. Miller
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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: default avatarSusant Sahani <susant@redhat.com>
Acked-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid 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]);