Limit size of outgoing P2P packets

Previously P2PSocketDispatcherHost didn't limit size of packets it receives
in P2PHostMsg_Send. Added a limit of 32k.

Review URL: https://codereview.chromium.org/27058006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228398 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 12 insertions, 0 deletions

diff --git a/content/browser/renderer_host/p2p/socket_dispatcher_host.cc b/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
index 21463a1..19258f7 100644
--- a/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
+++ b/content/browser/renderer_host/p2p/socket_dispatcher_host.cc
@@ -22,6 +22,8 @@ using content::BrowserThread;
 
 namespace content {
 
+const size_t kMaximumPacketSize = 32768;
+
 class P2PSocketDispatcherHost::DnsRequest {
  public:
   typedef base::Callback<void(const net::IPAddressNumber&)> DoneCallback;
@@ -227,6 +229,16 @@ void P2PSocketDispatcherHost::OnSend(int socket_id,
     LOG(ERROR) << "Received P2PHostMsg_Send for invalid socket_id.";
     return;
   }
+
+  if (data.size() > kMaximumPacketSize) {
+    LOG(ERROR) << "Received P2PHostMsg_Send with a packet that is too big: "
+               << data.size();
+    Send(new P2PMsg_OnError(socket_id));
+    delete socket;
+    sockets_.erase(socket_id);
+    return;
+  }
+
   socket->Send(socket_address, data);
 }