[PATCH 1/6] ntdll: Ignore back pointer when validating free block pattern.

[Rémi Bernon]

From: Rémi Bernon

Signed-off-by: Rémi Bernon 
---
 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)
         {