ntdll: Mask block flags when computing HEAP_InsertFreeBlock size.

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

ntdll: Mask block flags when computing HEAP_InsertFreeBlock size.
ba21d8fd · Rémi Bernon · Alexandre Julliard · 0416d2f1 · ba21d8fd
Commit ba21d8fd authored May 03, 2022 by Rémi Bernon Committed by Alexandre Julliard May 20, 2022
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heap.c dlls/ntdll/heap.c +2 -1

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--- a/dlls/ntdll/heap.c
+++ b/dlls/ntdll/heap.c
@@ -586,7 +586,8 @@ static HEAP *HEAP_GetPtr(
 */
 static inline void HEAP_InsertFreeBlock( HEAP *heap, ARENA_FREE *pArena, BOOL last )
 {
-    FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( pArena->size + sizeof(*pArena) );
+    SIZE_T block_size = (pArena->size & ARENA_SIZE_MASK) + sizeof(*pArena);
+    FREE_LIST_ENTRY *pEntry = heap->freeList + get_freelist_index( block_size );
    if (last)
    {
        /* insert at end of free list, i.e. before the next free list entry */