From c2eead9629b60a394aa61e6f96b89647eddce1ea Mon Sep 17 00:00:00 2001
From: Jonathan Marler <johnnymarler@gmail.com>
Date: Sun, 28 Jun 2020 14:33:41 -0600
Subject: Fix issue 5741, use after free

---
 lib/std/heap.zig | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib/std/heap.zig')

diff --git a/lib/std/heap.zig b/lib/std/heap.zig
index 260841ad2d..ea9e95c675 100644
--- a/lib/std/heap.zig
+++ b/lib/std/heap.zig
@@ -714,6 +714,11 @@ test "PageAllocator" {
         slice[127] = 0x34;
         allocator.free(slice);
     }
+    {
+        var buf = try allocator.alloc(u8, mem.page_size + 1);
+        defer allocator.free(buf);
+        buf = try allocator.realloc(buf, 1); // shrink past the page boundary
+    }
 }
 
 test "HeapAllocator" {
-- 
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