[PATCH v3 1/2] wined3d: Add more padding to resource memory allocations.

[Rémi Bernon]

From: Rémi Bernon

---
 dlls/wined3d/resource.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/dlls/wined3d/resource.c b/dlls/wined3d/resource.c
index 9d3fd0a426d..5351fbd3025 100644
--- 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)))