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| author | Taehee Yoo <ap420073@gmail.com> | 2019-04-30 01:55:54 +0900 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-04-30 13:56:19 +0200 |
| commit | 33cc3c0cfa64c86b6c4bbee86997aea638534931 (patch) | |
| tree | 8bfaf82f1fc93007863fb85b1ae2146600357497 /net | |
| parent | 26a302afbe328ecb7507cae2035d938e6635131b (diff) | |
| download | linux-stable-33cc3c0cfa64c86b6c4bbee86997aea638534931.tar.gz linux-stable-33cc3c0cfa64c86b6c4bbee86997aea638534931.tar.bz2 linux-stable-33cc3c0cfa64c86b6c4bbee86997aea638534931.zip | |
netfilter: nf_flow_table: check ttl value in flow offload data path
nf_flow_offload_ip_hook() and nf_flow_offload_ipv6_hook() do not check
ttl value. So, ttl value overflow may occur.
Fixes: 97add9f0d66d ("netfilter: flow table support for IPv4")
Fixes: 0995210753a2 ("netfilter: flow table support for IPv6")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_flow_table_ip.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c index 1d291a51cd45..46022a2867d7 100644 --- a/net/netfilter/nf_flow_table_ip.c +++ b/net/netfilter/nf_flow_table_ip.c @@ -181,6 +181,9 @@ static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev, iph->protocol != IPPROTO_UDP) return -1; + if (iph->ttl <= 1) + return -1; + thoff = iph->ihl * 4; if (!pskb_may_pull(skb, thoff + sizeof(*ports))) return -1; @@ -411,6 +414,9 @@ static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev, ip6h->nexthdr != IPPROTO_UDP) return -1; + if (ip6h->hop_limit <= 1) + return -1; + thoff = sizeof(*ip6h); if (!pskb_may_pull(skb, thoff + sizeof(*ports))) return -1; |