diff options
| author |   Patrick McHardy <kaber@trash.net> | 2013-04-05 08:13:30 +0000 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2013-04-06 14:03:18 +0200 |
| commit | 3a7b21eaf4fb3c971bdb47a98f570550ddfe4471 (patch) | |
| tree | 2b2f4450f88603a83fb2c31bb48fbc1ea1c29761 /net | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
| download | linux-dev-3a7b21eaf4fb3c971bdb47a98f570550ddfe4471.tar.xz linux-dev-3a7b21eaf4fb3c971bdb47a98f570550ddfe4471.zip | |
netfilter: nf_ct_sip: don't drop packets with offsets pointing outside the packet
Some Cisco phones create huge messages that are spread over multiple packets.
After calculating the offset of the SIP body, it is validated to be within
the packet and the packet is dropped otherwise. This breaks operation of
these phones. Since connection tracking is supposed to be passive, just let
those packets pass unmodified and untracked.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_conntrack_sip.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 0e7d423324c3..e0c4373b4747 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -1593,10 +1593,8 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff, end += strlen("\r\n\r\n") + clen; msglen = origlen = end - dptr; - if (msglen > datalen) { - nf_ct_helper_log(skb, ct, "incomplete/bad SIP message"); - return NF_DROP; - } + if (msglen > datalen) + return NF_ACCEPT; ret = process_sip_msg(skb, ct, protoff, dataoff, &dptr, &msglen); |