Merge pull request brianc#675 from brianc/issues/675

Postgres Native bindings Segfault when querying with empty buffer

Author: brianc

.travis.yml

@@ -3,3 +3,5 @@ node_js:
   - "0.10"
 before_script:
   - node script/create-test-tables.js pg://[email protected]:5432/postgres
+env:
+  - PGUSER=postgres PGDATABASE=postgres

src/binding.cc

@@ -876,13 +876,17 @@ class Connection : public ObjectWrap {
       } else if(val->IsNull()) {
         paramValues[i] = NULL;
       } else if(val->IsObject() && Buffer::HasInstance(val)) {
-        char *cHexString = MallocCHexString(val->ToObject());
-        if(!cHexString) {
-          LOG("ArgToCStringArray: OUT OF MEMORY OR SOMETHING BAD!");
-          ReleaseCStringArray(paramValues, i-1);
-          return 0;
+        if(Buffer::Length(val) > 0) {
+          char *cHexString = MallocCHexString(val->ToObject());
+          if(!cHexString) {
+            LOG("ArgToCStringArray: OUT OF MEMORY OR SOMETHING BAD!");
+            ReleaseCStringArray(paramValues, i-1);
+            return 0;
+          }
+          paramValues[i] = cHexString;
+        } else {
+          paramValues[i] = MallocCString(NanNew<String>(""));
         }
-        paramValues[i] = cHexString;
       } else {
         //a paramter was not a string
         LOG("Parameter not a string or buffer");

test/integration/gh-issues/675-tests.js

@@ -0,0 +1,28 @@
+var helper = require('../test-helper');
+var assert = require('assert');
+
+helper.pg.connect(function(err, client, done) {
+  if (err) throw err;
+
+  var c = 'CREATE TEMP TABLE posts (body TEXT)';
+
+  client.query(c, function(err) {
+    if (err) throw err;
+
+    c = 'INSERT INTO posts (body) VALUES ($1) RETURNING *';
+
+    var body = new Buffer('foo');
+    client.query(c, [body], function(err) {
+      if (err) throw err;
+
+      body = new Buffer([]);
+      client.query(c, [body], function(err, res) {
+        done();
+
+        if (err) throw err;
+        assert.equal(res.rows[0].body, '')
+        helper.pg.end();
+      });
+    });
+  });
+});