From e2b9c61998a932638dd693e68bfa12e41f30114e Mon Sep 17 00:00:00 2001
From: David Vacca <dvacca@fb.com>
Date: Tue, 20 Apr 2021 12:11:25 -0700
Subject: [PATCH] Add assertion when building MapBuffer

Summary:
This diff adds an assertion when trying to build a MapBuffer with invalid data

changelog: [internal] internal

Reviewed By: sammy-SC

Differential Revision: D27864309

fbshipit-source-id: 6601388e56be18ded0675f92cce009a577828c16
---
 ReactCommon/react/renderer/mapbuffer/MapBufferBuilder.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ReactCommon/react/renderer/mapbuffer/MapBufferBuilder.cpp b/ReactCommon/react/renderer/mapbuffer/MapBufferBuilder.cpp
index ae2db84ff7..2aff6f0f48 100644
--- a/ReactCommon/react/renderer/mapbuffer/MapBufferBuilder.cpp
+++ b/ReactCommon/react/renderer/mapbuffer/MapBufferBuilder.cpp
@@ -160,6 +160,10 @@ void MapBufferBuilder::putMapBuffer(Key key, MapBuffer &map) {
 }
 
 MapBuffer MapBufferBuilder::build() {
+  react_native_assert(
+      (keyValues_ != nullptr) &&
+      "Error when building mapbuffer with invalid datastructures.");
+
   // Create buffer: [header] + [key, values] + [dynamic data]
   int bufferSize = keyValuesOffset_ + dynamicDataOffset_;