net: prevent /32 ipv4 mask from matching all ips

Fixes: nodejs#43360
supriyo-biswas · Jun 11, 2022 · 3736cdb · 3736cdb
1 parent 3987d6b
commit 3736cdb
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/node_sockaddr.cc b/src/node_sockaddr.cc
@@ -215,6 +215,9 @@ bool in_network_ipv4(
     const SocketAddress& ip,
     const SocketAddress& net,
     int prefix) {
+  if (prefix == 32)
+    return compare_ipv4(ip, net) == SocketAddress::CompareResult::SAME;
+
   uint32_t mask = ((1 << prefix) - 1) << (32 - prefix);
 
   const sockaddr_in* ip_in =