[WIN32K:NTUSER]

- Initialize BITMAPINFOHEADER::biSize before calling GreGetDIBitsInternal in IntSynthesizeDib. Fixes use of uninitialized memory and subsequent stack buffer overflow.
CORE-13408

svn path=/trunk/; revision=74991

reactos/win32ss/user/ntuser/clipboard.c

@@ -154,6 +154,7 @@ IntSynthesizeDib(
     }
 
     /* Get information about the bitmap format */
+    pbmi->bmiHeader.biSize = sizeof(bmiBuffer.bmih);
     iResult = GreGetDIBitsInternal(hdc,
                                    hbm,
                                    0,