firewall3: fix left shift on 64 bit systems in fw3_bitlen2netmask

[project/firewall3.git] / utils.c

diff --git a/utils.c b/utils.c
index 71a0f13..b2fbe02 100644 (file)
--- a/utils.c
+++ b/utils.c
@@ -803,7 +803,7 @@ fw3_bitlen2netmask(int family, int bits, void *mask)
                        return false;
 
                v4 = mask;
-               v4->s_addr = htonl(~((1 << (32 - abs(bits))) - 1));
+               v4->s_addr = bits ? htonl(~((1 << (32 - abs(bits))) - 1)) : 0;
 
                if (bits < 0)
                        v4->s_addr = ~v4->s_addr;