Fix instability in SSL client/server sockets

net/socket/ssl_server_socket_nss.cc

Index: net/socket/ssl_server_socket_nss.cc
diff --git a/net/socket/ssl_server_socket_nss.cc b/net/socket/ssl_server_socket_nss.cc
index bdcff2c1002aab343b04c8327ea970b7ec844524..83a382e6851e30a360a06947d31f43ac4d91c57b 100644
--- a/net/socket/ssl_server_socket_nss.cc
+++ b/net/socket/ssl_server_socket_nss.cc
@@ -528,14 +528,22 @@ void SSLServerSocketNSS::BufferRecvComplete(int result) {
   OnRecvComplete(result);
 }
 
-// Do network I/O between the given buffer and the given socket.
-// Return true if some I/O performed, false otherwise (error or ERR_IO_PENDING)
+// Do as much network I/O as possible between the buffer and the
+// transport socket. Return true if some I/O performed, false
+// otherwise (error or ERR_IO_PENDING).
 bool SSLServerSocketNSS::DoTransportIO() {
   bool network_moved = false;
   if (nss_bufs_ != NULL) {
-    int nsent = BufferSend();
-    int nreceived = BufferRecv();
-    network_moved = (nsent > 0 || nreceived >= 0);
+    int rv;
+    // Read and write as much data as we can. The loop is neccessary
+    // because Write() may return synchronously.
+    do {
+      rv = BufferSend();
+      if (rv > 0)
+        network_moved = true;
+    } while (rv > 0);
+    if (BufferRecv() >= 0)
+      network_moved = true;
   }
   return network_moved;
 }