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

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "nacl_io/socket/socket_node.h"
 
 #include "nacl_io/ossocket.h"
 #ifdef PROVIDES_SOCKET_API
 
 #include <errno.h>
@@ skipping 139 matching lines @@
     return 0;
 
   PP_NetAddress_IPv4 ipv4;
   PP_NetAddress_IPv6 ipv6;
 
   if (PP_TRUE == NetInterface()->DescribeAsIPv4Address(addr, &ipv4)) {
     sockaddr_in addr4;
     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)) {
     sockaddr_in6 addr6;
     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;
 }
 
 bool SocketNode::IsEquivalentAddress(PP_Resource addr1, PP_Resource addr2) {
   if (addr1 == addr2)
     return true;
 
   char data1[sizeof(sockaddr_in6)];
@@ skipping 288 matching lines @@
     return 0;
   }
 
   *len = ResourceToSockAddr(local_addr_, *len, addr);
   return 0;
 }
 
 }  // namespace nacl_io
 
 #endif  // PROVIDES_SOCKET_API