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dhcpv4: avoid segfault when there's no IPv4 prefix
[project/odhcpd.git]
/
src
/
dhcpv4.c
diff --git
a/src/dhcpv4.c
b/src/dhcpv4.c
index
c7ac058
..
b0a4603
100644
(file)
--- a/
src/dhcpv4.c
+++ b/
src/dhcpv4.c
@@
-95,7
+95,8
@@
int setup_dhcpv4_interface(struct interface *iface, bool enable)
return -1;
}
return -1;
}
- uint32_t mask = iface->addr4[0].prefix ? htonl(~((1 << (32 - iface->addr4[0].prefix)) - 1)) : 0;
+ uint32_t mask = iface->addr4 && iface->addr4[0].prefix ?
+ htonl(~((1 << (32 - iface->addr4[0].prefix)) - 1)) : 0xffffffff;
/* Create a range if not specified */
if (!(iface->dhcpv4_start.s_addr & htonl(0xffff0000)) &&
/* Create a range if not specified */
if (!(iface->dhcpv4_start.s_addr & htonl(0xffff0000)) &&