wined3d: Add more padding to resource memory allocations.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55773

wined3d: Add more padding to resource memory allocations.
e7d7ac77 · Rémi Bernon · Alexandre Julliard · 4e95553a · e7d7ac77
Commit e7d7ac77 authored Dec 15, 2023 by Rémi Bernon Committed by Alexandre Julliard Dec 20, 2023
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resource.c dlls/wined3d/resource.c +5 -1

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--- a/dlls/wined3d/resource.c
+++ b/dlls/wined3d/resource.c
@@ -332,7 +332,11 @@ void CDECL wined3d_resource_preload(struct wined3d_resource *resource)
 static BOOL wined3d_resource_allocate_sysmem(struct wined3d_resource *resource)
 {
    void **p;
-    SIZE_T align = RESOURCE_ALIGNMENT - 1 + sizeof(*p);
+    /* Overallocate and add padding to the allocated pointer, to guard against
+     * games (for instance Railroad Tycoon 2) writing before the locked resource
+     * memory pointer.
+     */
+    SIZE_T align = RESOURCE_ALIGNMENT + sizeof(*p);
    void *mem;

    if (!(mem = heap_alloc_zero(resource->size + align)))