diff options
| -rw-r--r-- | libnetutils/ifc_utils.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/libnetutils/ifc_utils.c b/libnetutils/ifc_utils.c index 0ca5fe6..95a144c 100644 --- a/libnetutils/ifc_utils.c +++ b/libnetutils/ifc_utils.c @@ -224,6 +224,11 @@ in_addr_t get_ipv4_netmask(int prefix_length) { in_addr_t mask = 0; + // C99 (6.5.7): shifts of 32 bits have undefined results + if (prefix_length == 0) { + return 0; + } + mask = ~mask << (32 - prefix_length); mask = htonl(mask); |