From: Jeremy Sowden jeremy@azazel.net
stable inclusion from linux-4.19.212 commit d169887d824bff0101c7c7ec2292d250e8cfe95d
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[ Upstream commit 310e2d43c3ad429c1fba4b175806cf1f55ed73a6 ]
ip6tables only sets the `IP6T_F_PROTO` flag on a rule if a protocol is specified (`-p tcp`, for example). However, if the flag is not set, `ip6_packet_match` doesn't call `ipv6_find_hdr` for the skb, in which case the fragment offset is left uninitialized and a garbage value is passed to each matcher.
Signed-off-by: Jeremy Sowden jeremy@azazel.net Reviewed-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org Acked-by: Jason Yan yanaijie@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- net/ipv6/netfilter/ip6_tables.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index dd0c1073dc8ee..d93490ac82759 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -276,6 +276,7 @@ ip6t_do_table(struct sk_buff *skb, * things we don't know, ie. tcp syn flag or ports). If the * rule is also a fragment-specific rule, non-fragments won't * match it. */ + acpar.fragoff = 0; acpar.hotdrop = false; acpar.state = state;