zlib: prevent uncaught exception in zlibBuffer

Author: targos

lib/zlib.js

@@ -209,10 +209,16 @@ function zlibBuffer(engine, buffer, callback) {
   }
 
   function onEnd() {
-    var buf = Buffer.concat(buffers, nread);
-    buffers = [];
-    callback(null, buf);
-    engine.close();
+    try {
+      let buf = Buffer.concat(buffers, nread);
+      buffers = [];
+      callback(null, buf);
+    } catch (e) {
+      buffers = [];
+      callback(e);
+    } finally {
+      engine.close();
+    }
   }
 }