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Commit 45efccdb authored by Eric Dumazet's avatar Eric Dumazet Committed by Pablo Neira Ayuso
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netfilter: xt_TEE: fix NULL dereference 



iptables -I INPUT ... -j TEE --gateway 10.1.2.3

<crash> because --oif was not specified

tee_tg_check() sets ->priv pointer to NULL in this case.

Fixes: bbde9fc1 ("netfilter: factor out packet duplication for IPv4/IPv6")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 104eb270

net/netfilter/xt_TEE.c

+4 −2
Original line number Diff line number Diff line
@@ -31,8 +31,9 @@ static unsigned int 
tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)

{

	const struct xt_tee_tginfo *info = par->targinfo;

	int oif = info->priv ? info->priv->oif : 0;



	nf_dup_ipv4(skb, par->hooknum, &info->gw.in, info->priv->oif);

	nf_dup_ipv4(skb, par->hooknum, &info->gw.in, oif);



	return XT_CONTINUE;

}
@@ -42,8 +43,9 @@ static unsigned int 
tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)

{

	const struct xt_tee_tginfo *info = par->targinfo;

	int oif = info->priv ? info->priv->oif : 0;



	nf_dup_ipv6(skb, par->hooknum, &info->gw.in6, info->priv->oif);

	nf_dup_ipv6(skb, par->hooknum, &info->gw.in6, oif);



	return XT_CONTINUE;

}