From: Christophe Leroy Date: Wed, 3 Aug 2016 10:41:40 +0000 (+0200) Subject: netfilter: nf_conntrack_sip: CSeq 0 is a valid CSeq X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0d35d0815b19216f852f257afe420f7c7d182780;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git netfilter: nf_conntrack_sip: CSeq 0 is a valid CSeq 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 Signed-off-by: Pablo Neira Ayuso --- diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index 8d9db9d4702b..7d77217de6a3 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; }