| From 992e007b33e03118a605917e8f78d699b4b9141a Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Sun, 12 Sep 2021 22:24:33 +0100 |
| Subject: netfilter: ip6_tables: zero-initialize fragment offset |
| |
| From: Jeremy Sowden <jeremy@azazel.net> |
| |
| [ 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> |
| --- |
| 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 de2cf3943b91..a579ea14a69b 100644 |
| --- a/net/ipv6/netfilter/ip6_tables.c |
| +++ b/net/ipv6/netfilter/ip6_tables.c |
| @@ -273,6 +273,7 @@ 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; |
| |
| -- |
| 2.33.0 |
| |
