Check IP address size when deserializing IPEndPoint.

Failure to do so leads to a CHECK() in the browser under the IPC fuzzing
tests, which generates a lot of false positives.  Instead, we can invert
the situation and blame the renderer.

BUG=349572

Review URL: https://codereview.chromium.org/183023016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255686 0039d316-1c4b-4281-b951-d872f2087c98

content/public/common/common_param_traits.cc

@@ -120,6 +120,11 @@ bool ParamTraits<net::IPEndPoint>::Read(const Message* m, PickleIterator* iter,
   int port;
   if (!ReadParam(m, iter, &address) || !ReadParam(m, iter, &port))
     return false;
+  if (address.size() &&
+      address.size() != net::kIPv4AddressSize &&
+      address.size() != net::kIPv6AddressSize) {
+    return false;
+  }
   *p = net::IPEndPoint(address, port);
   return true;
 }