From b6183b2af6a16746cc85afaa7faeb3626d4d9121 Mon Sep 17 00:00:00 2001
From: Robert Norton <robert.norton@microsoft.com>
Date: Mon, 21 Feb 2022 18:00:42 +0000
Subject: [PATCH] Set errno on realloc failure.

This was not being done for certain cases as per microsoft/snmalloc#460.
Note that malloc and calloc are probably still not setting errno for
those cases but this is not currently tested...
---
 src/override/malloc.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/override/malloc.cc b/src/override/malloc.cc
index a04e1dc45..de0eadc9d 100644
--- a/src/override/malloc.cc
+++ b/src/override/malloc.cc
@@ -98,6 +98,10 @@ extern "C"
     {
       a.dealloc(ptr);
     }
+    else
+    {
+      errno = ENOMEM;
+    }
     return p;
   }