From: Jo-Philipp Wich <jow@openwrt.org>
Date: Tue, 18 Jun 2013 14:11:56 +0000 (+0200)
Subject: Fix processing of CIDRs with mask 0
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=098b7d6add425aadb0cfe5af34c5d88d5320d33f;p=oweals%2Ffirewall3.git

Fix processing of CIDRs with mask 0
---

diff --git a/iptables.c b/iptables.c
index df0d704..7d91452 100644
--- a/iptables.c
+++ b/iptables.c
@@ -609,7 +609,10 @@ fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 static void
 ip4prefix2mask(int prefix, struct in_addr *mask)
 {
-	mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
+	if (prefix > 0)
+		mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
+	else
+		mask->s_addr = 0;
 }
 
 #ifndef DISABLE_IPV6