From 2815c117bcfefe4889b35701734435d578772af2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Bernon?= <rbernon@codeweavers.com>
Date: Thu, 19 May 2022 09:13:20 +0200
Subject: [PATCH] ntdll: Ignore back pointer when validating free block
 pattern.
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Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/ntdll/heap.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dlls/ntdll/heap.c b/dlls/ntdll/heap.c
index 44c9ad53196..e4a307bd23a 100644
--- a/dlls/ntdll/heap.c
+++ b/dlls/ntdll/heap.c
@@ -1182,6 +1182,7 @@ static BOOL validate_free_block( const SUBHEAP *subheap, const struct block *blo
     if (!err && (flags & HEAP_FREE_CHECKING_ENABLED))
     {
         const char *ptr = (char *)(entry + 1), *end = (char *)block + block_get_size( block );
+        if (next) end -= sizeof(struct block *);
         if (end > commit_end) end = commit_end;
         while (!err && ptr < end)
         {