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| author | Jeremy Sowden <jeremy@azazel.net> | 2021-09-12 22:24:33 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-17 10:19:48 +0200 |
| commit | d169887d824bff0101c7c7ec2292d250e8cfe95d (patch) | |
| tree | 856045d5bbd624f38ada4ac5769b900985a6c880 /net | |
| parent | c9f4440a1f5a9d91ed72b35232f0147d6efcc8ae (diff) | |
| download | linux-d169887d824bff0101c7c7ec2292d250e8cfe95d.tar.gz linux-d169887d824bff0101c7c7ec2292d250e8cfe95d.tar.bz2 linux-d169887d824bff0101c7c7ec2292d250e8cfe95d.zip | |
netfilter: ip6_tables: zero-initialize fragment offset
[ 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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/netfilter/ip6_tables.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index dd0c1073dc8e..d93490ac8275 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; |