netfilter: ipv6: fix use-after-free Write in nf_nat_ipv6_manip_pkt
commit b078556aecd791b0e5cb3a59f4c3a14273b52121 upstream.
l4proto->manip_pkt() can cause reallocation of skb head so pointer
to the ipv6 header must be reloaded.
Change-Id: Ib9d20d8a0c62e880ed2adc6ee666654c47ceb7f9
Reported-and-tested-by: <syzbot+10005f4292fc9cc89de7@syzkaller.appspotmail.com>
Fixes: 58a317f106
("netfilter: ipv6: add IPv6 NAT support")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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dd945fcac6
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283a8c8491
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@ -99,6 +99,10 @@ static bool nf_nat_ipv6_manip_pkt(struct sk_buff *skb,
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!l4proto->manip_pkt(skb, &nf_nat_l3proto_ipv6, iphdroff, hdroff,
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target, maniptype))
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return false;
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/* must reload, offset might have changed */
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ipv6h = (void *)skb->data + iphdroff;
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manip_addr:
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if (maniptype == NF_NAT_MANIP_SRC)
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ipv6h->saddr = target->src.u3.in6;
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