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authorJeremy Sowden <jeremy@azazel.net>2021-09-12 22:24:33 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2021-09-15 17:00:28 +0200
commit310e2d43c3ad429c1fba4b175806cf1f55ed73a6 (patch)
tree37b5356573dcc2d35b983a5c68cbaf2f20efa3a5 /net
parent69e73dbfda14fbfe748d3812da1244cce2928dcb (diff)
netfilter: ip6_tables: zero-initialize fragment offset
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/netfilter/ip6_tables.c1
1 files changed, 1 insertions, 0 deletions
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;