Messages in this thread Patch in this message | | | Date | Wed, 01 Jun 2011 17:10:22 +0900 | From | Greg KH <> | Subject | [052/165] netfilter: nf_ct_sip: fix SDP parsing in TCP SIP messages for some Cisco phones |
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2.6.39-stable review patch. If anyone has any objections, please let us know.
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From: Patrick McHardy <kaber@trash.net>
[ Upstream commit e6e4d9ed11fb1fab8b3256a3dc14d71b5e984ac4 ]
Some Cisco phones do not place the Content-Length field at the end of the SIP message. This is valid, due to a misunderstanding of the specification the parser expects the SDP body to start directly after the Content-Length field. Fix the parser to scan for \r\n\r\n to locate the beginning of the SDP body.
Reported-by: Teresa Kang <teresa_kang@gemtek.com.tw> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- net/netfilter/nf_conntrack_sip.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
--- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -1419,6 +1419,7 @@ static int sip_help_tcp(struct sk_buff * const char *dptr, *end; s16 diff, tdiff = 0; int ret = NF_ACCEPT; + bool term; typeof(nf_nat_sip_seq_adjust_hook) nf_nat_sip_seq_adjust; if (ctinfo != IP_CT_ESTABLISHED && @@ -1453,10 +1454,15 @@ static int sip_help_tcp(struct sk_buff * if (dptr + matchoff == end) break; - if (end + strlen("\r\n\r\n") > dptr + datalen) - break; - if (end[0] != '\r' || end[1] != '\n' || - end[2] != '\r' || end[3] != '\n') + term = false; + for (; end + strlen("\r\n\r\n") <= dptr + datalen; end++) { + if (end[0] == '\r' && end[1] == '\n' && + end[2] == '\r' && end[3] == '\n') { + term = true; + break; + } + } + if (!term) break; end += strlen("\r\n\r\n") + clen;
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