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| author | Phil Oester <kernel@linuxace.com> | 2013-06-12 10:58:20 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-06-12 11:06:19 +0200 |
| commit | b396966c4688522863572927cb30aa874b3ec504 (patch) | |
| tree | 2ab7edf42c311da4d04b33788c76cca272e730fa | |
| parent | 70d19f805f8c047fc0a28dec9306b3773971c8d9 (diff) | |
| download | linux-b396966c4688522863572927cb30aa874b3ec504.tar.bz2 | |
netfilter: xt_TCPMSS: Fix missing fragmentation handling
Similar to commit bc6bcb59 ("netfilter: xt_TCPOPTSTRIP: fix
possible mangling beyond packet boundary"), add safe fragment
handling to xt_TCPMSS.
Signed-off-by: Phil Oester <kernel@linuxace.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/xt_TCPMSS.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/netfilter/xt_TCPMSS.c b/net/netfilter/xt_TCPMSS.c index 6640a224f9fb..7011c71646f0 100644 --- a/net/netfilter/xt_TCPMSS.c +++ b/net/netfilter/xt_TCPMSS.c @@ -57,6 +57,10 @@ tcpmss_mangle_packet(struct sk_buff *skb, u16 newmss; u8 *opt; + /* This is a fragment, no TCP header is available */ + if (par->fragoff != 0) + return XT_CONTINUE; + if (!skb_make_writable(skb, skb->len)) return -1; |