SERVER-22767 mongos segfault when invoking .explain() on certain operations

1 files changed, 21 insertions, 0 deletions

diff --git a/jstests/core/server22767.js b/jstests/core/server22767.js
new file mode 100644
index 00000000000..9b915ce0940
--- /dev/null
+++ b/jstests/core/server22767.js
@@ -0,0 +1,21 @@
+// test that the mongos doesn't segfault when it receives malformed BSON
+var st = new ShardingTest({shards:1});
+var testDB = st.getDB('test');
+testDB.test.insert({a:1});
+
+try {
+    testDB.test.find({key: {$regex: 'abcd\0xyz'}}).explain();
+} catch (e) {
+    /*
+     * if the mongos segfaults, the error is the msg:
+     * "Error: error doing query: failed: network error while attempting to run command 'explain' on host '127.0.0.1:20014'"
+     *
+     * if the mongos doesn't segfault, the error is the object:
+     * "Error: explain failed: {
+     *   "code" : 22,
+     *   "ok" : 0,
+     *   "errmsg" : "bson length doesn't match what we found in object with unknown _id"
+     * }"
+     */
+    assert.eq(22, e.code);
+}
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