From 832151ec174ca8ece535903664777d73d1ae0d37 Mon Sep 17 00:00:00 2001
From: Matt Boros <matt.boros@mongodb.com>
Date: Mon, 12 Sep 2022 18:24:49 +0000
Subject: SERVER-69005 $internalBoundedSort should not accept empty sort
 pattern

(cherry picked from commit a14ebbf41e0ae4346e806e1ac5d7a3fdaa42d529)
---
 src/mongo/db/pipeline/document_source_sort.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/mongo/db/pipeline/document_source_sort.cpp b/src/mongo/db/pipeline/document_source_sort.cpp
index 3255568c7b9..fbab28b7e08 100644
--- a/src/mongo/db/pipeline/document_source_sort.cpp
+++ b/src/mongo/db/pipeline/document_source_sort.cpp
@@ -487,6 +487,10 @@ intrusive_ptr<DocumentSourceSort> DocumentSourceSort::parseBoundedSort(
     BSONElement key = args["sortKey"];
     uassert(6369904, "$_internalBoundedSort sortKey must be an object", key.type() == Object);
 
+    // Empty sort pattern is not allowed for the bounded sort.
+    uassert(6900501,
+            "$_internalBoundedSort stage must have at least one sort key",
+            !key.embeddedObject().isEmpty());
     SortPattern pat{key.embeddedObject(), expCtx};
 
     {
-- 
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