Fix writing truncated packets starting with large string/buffer

fixes #1438
mysqljs · Jun 8, 2016 · e931562 · e931562
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diff --git a/Changes.md b/Changes.md
@@ -4,6 +4,10 @@ This file is a manually maintained list of changes for each release. Feel free
 to add your changes here when sending pull requests. Also send corrections if
 you spot any mistakes.
 
+## HEAD
+
+* Fix writing truncated packets starting with large string/buffer #1438
+
 ## v2.11.0 (2016-06-06)
 
 * Add `POOL_CLOSED` code to "Pool is closed." error

diff --git a/lib/protocol/PacketWriter.js b/lib/protocol/PacketWriter.js
@@ -188,7 +188,7 @@ PacketWriter.prototype.writeLengthCodedString = function(value) {
 
 PacketWriter.prototype._allocate = function _allocate(bytes) {
   if (!this._buffer) {
-    this._buffer = new Buffer(BUFFER_ALLOC_SIZE);
+    this._buffer = new Buffer(Math.max(BUFFER_ALLOC_SIZE, bytes));
     this._offset = 0;
     return;
   }