Do not drop packet when CSeq is 0 as 0 is also a valid value for CSeq.
simple_strtoul() will return 0 either when all digits are 0
or if there are no digits at all. Therefore when simple_strtoul()
returns 0 we check if first character is digit 0 or not.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
v2: not using kstrtouint() anymore, as it required to use a temp buffer
net/netfilter/nf_conntrack_sip.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 8d9db9d..7d77217 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -1383,7 +1383,7 @@ static int process_sip_response(struct sk_buff *skb,
unsigned int protoff,
return NF_DROP;
}
cseq = simple_strtoul(*dptr + matchoff, NULL, 10);
- if (!cseq) {
+ if (!cseq && *(*dptr + matchoff) != '0') {
nf_ct_helper_log(skb, ct, "cannot get cseq");
return NF_DROP;
}
@@ -1446,7 +1446,7 @@ static int process_sip_request(struct sk_buff *skb,
unsigned int protoff,
return NF_DROP;
}
cseq = simple_strtoul(*dptr + matchoff, NULL, 10);
- if (!cseq) {
+ if (!cseq && *(*dptr + matchoff) != '0') {
nf_ct_helper_log(skb, ct, "cannot get cseq");
return NF_DROP;
}
--
2.1.0
