nacl_io: only copy up to the size of the sockaddr_in*, not the given len.

native_client_sdk/src/libraries/nacl_io/socket/socket_node.cc

Index: native_client_sdk/src/libraries/nacl_io/socket/socket_node.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/socket/socket_node.cc b/native_client_sdk/src/libraries/nacl_io/socket/socket_node.cc
index 831345557bd91d5f3ee3e35d3f3715c6f1a3bfc6..0fef5f269cca74811150fd4cb8b1e71ae4ff0d9a 100644
--- a/native_client_sdk/src/libraries/nacl_io/socket/socket_node.cc
+++ b/native_client_sdk/src/libraries/nacl_io/socket/socket_node.cc
@@ -157,10 +157,11 @@ socklen_t SocketNode::ResourceToSockAddr(PP_Resource addr,
     addr4.sin_family = AF_INET;
     addr4.sin_port = ipv4.port;
     memcpy(&addr4.sin_addr, ipv4.addr, sizeof(ipv4.addr));
-    memcpy(out_addr, &addr4, len);
+    memcpy(out_addr, &addr4,
+           std::min(len, static_cast<socklen_t>(sizeof(addr4))));
 
     // Returns required size not copied size like getpeername/getsockname.
-    return sizeof(sockaddr_in);
+    return sizeof(addr4);
   }
 
   if (PP_TRUE == NetInterface()->DescribeAsIPv6Address(addr, &ipv6)) {
@@ -168,10 +169,11 @@ socklen_t SocketNode::ResourceToSockAddr(PP_Resource addr,
     addr6.sin6_family = AF_INET6;
     addr6.sin6_port = ipv6.port;
     memcpy(&addr6.sin6_addr, ipv6.addr, sizeof(ipv6.addr));
-    memcpy(out_addr, &addr6, len);
+    memcpy(out_addr, &addr6,
+           std::min(len, static_cast<socklen_t>(sizeof(addr6))));
 
     // Returns required size not copied size like getpeername/getsockname.
-    return sizeof(sockaddr_in6);
+    return sizeof(addr6);
   }
 
   return 0;