GetNetworkList() copies sa_family of ifa_addr to ifa_netmask if unset

net/base/net_util_posix.cc

Index: net/base/net_util_posix.cc
diff --git a/net/base/net_util_posix.cc b/net/base/net_util_posix.cc
index 5e1042b4304c6ba9ba8d17954c259edc2193f860..34f64ce162c9606341abdfb4ca107f23cb767002 100644
--- a/net/base/net_util_posix.cc
+++ b/net/base/net_util_posix.cc
@@ -143,6 +143,10 @@ bool GetNetworkList(NetworkInterfaceList* networks) {
     if (address.FromSockAddr(addr, addr_size)) {
       uint8 net_mask = 0;
       if (interface->ifa_netmask) {
+        // If not otherwise set, assume the same sa_family as ifa_addr.
+        if (interface->ifa_netmask->sa_family == 0) {
+          interface->ifa_netmask->sa_family = addr->sa_family;
+        }
         IPEndPoint netmask;
         if (netmask.FromSockAddr(interface->ifa_netmask, addr_size)) {
           net_mask = MaskPrefixLength(netmask.address());