From adeecfb0f1a489acf35badacf7315e128a8f731b Mon Sep 17 00:00:00 2001
From: Matthew Parkinson <mattpark@microsoft.com>
Date: Thu, 14 Feb 2019 19:59:58 +0000
Subject: [PATCH] Added bug fix to alignment of using.

---
 src/mem/largealloc.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/mem/largealloc.h b/src/mem/largealloc.h
index 3c8dd71..11aa6e0 100644
--- a/src/mem/largealloc.h
+++ b/src/mem/largealloc.h
@@ -196,13 +196,15 @@ namespace snmalloc
             memory_provider.template zero<true>(p, OS_PAGE_SIZE);
 
           memory_provider.template notify_using<zero_mem>(
-            (void*)((size_t)p + OS_PAGE_SIZE), size - OS_PAGE_SIZE);
+            (void*)((size_t)p + OS_PAGE_SIZE),
+            bits::align_up(size, OS_PAGE_SIZE) - OS_PAGE_SIZE);
         }
         else
         {
           // This is a superslab that has not been decommitted.
           if (zero_mem == YesZero)
-            memory_provider.template zero<true>(p, size);
+            memory_provider.template zero<true>(
+              p, bits::align_up(size, OS_PAGE_SIZE));
         }
       }