Fix memset bug in NetworkChangeNotifierLinux.

net/base/network_change_notifier_linux.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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 "net/base/network_change_notifier_linux.h"
 
 #include <errno.h>
 #include <sys/socket.h>
 
 #include "base/compiler_specific.h"
 #include "base/eintr_wrapper.h"
@@ skipping 113 matching lines @@
         MessageLoopForIO::WATCH_READ, &netlink_watcher_, this);
     LOG_IF(ERROR, !rv) << "Failed to watch netlink socket: " << netlink_fd_;
   }
 }
 
 int NetworkChangeNotifierLinux::Thread::ReadNotificationMessage(
     char* buf,
     size_t len) {
   DCHECK_NE(len, 0u);
   DCHECK(buf);
-  memset(buf, 0, sizeof(buf));
+  memset(buf, 0, len);
   int rv = recv(netlink_fd_, buf, len, 0);
   if (rv > 0)
     return rv;
 
   DCHECK_NE(rv, 0);
   if (errno != EAGAIN && errno != EWOULDBLOCK) {
     PLOG(DFATAL) << "recv";
     return ERR_FAILED;
   }
 
@@ skipping 14 matching lines @@
   // check that the notifier thread shut down properly.
   notifier_thread_->Stop();
 }
 
 bool NetworkChangeNotifierLinux::IsCurrentlyOffline() const {
   // TODO(eroman): http://crbug.com/53473
   return false;
 }
 
 }  // namespace net