[PATCH v2 2/6] d3dx9: Avoid crash in D3DXCheckTextureRequirements() if no replacement format found.

[Paul Gofman]

Signed-off-by: Paul Gofman 
---
 dlls/d3dx9_36/texture.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/dlls/d3dx9_36/texture.c b/dlls/d3dx9_36/texture.c
index 12cb2f3983..3f22b050b6 100644
--- a/dlls/d3dx9_36/texture.c
+++ b/dlls/d3dx9_36/texture.c
@@ -337,12 +337,15 @@ HRESULT WINAPI D3DXCheckTextureRequirements(struct IDirect3DDevice9 *device, UIN
     else if (h == D3DX_DEFAULT)
         h = (width ? w : 256);

-    assert(!(fmt->block_width & (fmt->block_width - 1)));
-    assert(!(fmt->block_height & (fmt->block_height - 1)));
-    if (w & (fmt->block_width - 1))
-        w = (w + fmt->block_width) & ~(fmt->block_width - 1);
-    if (h & (fmt->block_height - 1))
-        h = (h + fmt->block_height) & ~(fmt->block_height - 1);
+    if (fmt)
+    {
+        assert(!(fmt->block_width & (fmt->block_width - 1)));
+        assert(!(fmt->block_height & (fmt->block_height - 1)));
+        if (w & (fmt->block_width - 1))
+            w = (w + fmt->block_width) & ~(fmt->block_width - 1);
+        if (h & (fmt->block_height - 1))
+            h = (h + fmt->block_height) & ~(fmt->block_height - 1);
+    }

if ((caps.TextureCaps & D3DPTEXTURECAPS_POW2) && (!is_pow2(w)))
         w = make_pow2(w);