ntdll: Ignore back pointer when validating free block pattern.

Signed-off-by: Rémi Bernon <rbernon@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ntdll: Ignore back pointer when validating free block pattern.
2815c117 · Rémi Bernon · Alexandre Julliard · 034b7e30 · 2815c117
Commit 2815c117 authored May 19, 2022 by Rémi Bernon Committed by Alexandre Julliard May 19, 2022
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heap.c dlls/ntdll/heap.c +1 -0

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--- 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)
        {