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authorPatrick McHardy <kaber@trash.net>2011-05-16 14:42:26 +0200
committerPatrick McHardy <kaber@trash.net>2011-05-16 14:42:26 +0200
commit274ea0e2a4cdf18110e5931b8ecbfef6353e5293 (patch)
treed8d78f730253a0bd77a5e17557f4552005ba539b /net/netfilter
parent74973f6fbfcd1b084c3ccc75b783a6dacac94a10 (diff)
netfilter: nf_ct_sip: validate Content-Length in TCP SIP messages
Verify that the message length of a single SIP message, which is calculated based on the Content-Length field contained in the SIP message, does not exceed the packet boundaries. Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_conntrack_sip.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index bcf47eb518ef..1f81abde131f 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -1461,6 +1461,8 @@ 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)
+ return NF_DROP;
ret = process_sip_msg(skb, ct, dataoff, &dptr, &msglen);
if (ret != NF_ACCEPT)