Rémi Bernon : ntdll: Ignore back pointer when validating free block pattern.
Alexandre Julliard
julliard at winehq.org
Thu May 19 16:15:12 CDT 2022
Module: wine
Branch: master
Commit: 2815c117bcfefe4889b35701734435d578772af2
URL: https://source.winehq.org/git/wine.git/?a=commit;h=2815c117bcfefe4889b35701734435d578772af2
Author: Rémi Bernon <rbernon at codeweavers.com>
Date: Thu May 19 09:13:20 2022 +0200
ntdll: Ignore back pointer when validating free block pattern.
Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at 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)
{
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