gdi32: Check pointer in CreateDIBSection (bug 8066)

[Nikolay Sivov]

Changelog:
    - CreateDIBSection - check input ptr

---
 dlls/gdi32/dib.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/dlls/gdi32/dib.c b/dlls/gdi32/dib.c
index 980e0f3..e448eb3 100644
--- a/dlls/gdi32/dib.c
+++ b/dlls/gdi32/dib.c
@@ -1258,6 +1258,10 @@ HBITMAP WINAPI CreateDIBSection(HDC hdc, CONST BITMAPINFO *bmi, UINT usage,
     DWORD compression, sizeImage;
     void *mapBits = NULL;
 
+    /* LastError isn't set in this case */
+    if(!bmi)
+        return NULL;
+
     if (((bitmap_type = DIB_GetBitmapInfo( &bmi->bmiHeader, &width, &height,
                                            &planes, &bpp, &compression, &sizeImage )) == -1))
         return 0;
-- 
1.4.4.4