src: fix intermittent SIGSEGV in resolveTxt

Fixes a SIGSEGV by making sure `txt_chunk` is not empty before setting it on `txt_records` PR-URL: #960 Reviewed-By: Rod Vagg <rod@vagg.org>
nodejs · Feb 26, 2015 · e435a01 · e435a01
1 parent 0af4c9e
commit e435a01
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Showing 2 changed files with 11 additions and 2 deletions.
diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
@@ -611,8 +611,9 @@ class QueryTxtWrap: public QueryWrap {
       }
       txt_chunk->Set(j++, txt);
     }
-    // Push last chunk
-    txt_records->Set(i, txt_chunk);
+    // Push last chunk if it isn't empty
+    if (!txt_chunk.IsEmpty())
+      txt_records->Set(i, txt_chunk);
 
     ares_free_data(txt_out);
 

diff --git a/test/internet/test-dns-txt-sigsegv.js b/test/internet/test-dns-txt-sigsegv.js
@@ -0,0 +1,8 @@
+var common = require('../common');
+var assert = require('assert');
+var dns = require('dns');
+
+dns.resolveTxt('www.microsoft.com', function(err, records) {
+  assert.equal(err, null);
+  assert.equal(records.length, 0);
+});