gdi32: Properly set ERROR_NOACCESS when GetObject receives invalid arguments.

dlls/gdi32/gdiobj.c

@@ -973,7 +973,12 @@ INT WINAPI GetObjectA( HGDIOBJ handle, INT count, LPVOID buffer )
     GDI_ReleaseObj( handle );
 
     if (funcs && funcs->pGetObjectA)
-        result = funcs->pGetObjectA( handle, count, buffer );
+    {
+        if (buffer && ((ULONG_PTR)buffer >> 16) == 0) /* catch apps getting argument order wrong */
+            SetLastError( ERROR_NOACCESS );
+        else
+            result = funcs->pGetObjectA( handle, count, buffer );
+    }
     else
         SetLastError( ERROR_INVALID_HANDLE );
 
@@ -995,7 +1000,12 @@ INT WINAPI GetObjectW( HGDIOBJ handle, INT count, LPVOID buffer )
     GDI_ReleaseObj( handle );
 
     if (funcs && funcs->pGetObjectW)
-        result = funcs->pGetObjectW( handle, count, buffer );
+    {
+        if (buffer && ((ULONG_PTR)buffer >> 16) == 0) /* catch apps getting argument order wrong */
+            SetLastError( ERROR_NOACCESS );
+        else
+            result = funcs->pGetObjectW( handle, count, buffer );
+    }
     else
         SetLastError( ERROR_INVALID_HANDLE );
 

dlls/gdi32/tests/gdiobj.c

@@ -81,6 +81,14 @@ static void test_gdi_objects(void)
         "GetObject(NULL obj), expected 0, NO_ERROR, got %d, %u\n",
 	i, GetLastError());
 
+    /* GetObject expects ERROR_NOACCESS when passed an invalid buffer */
+    hp = SelectObject(hdc, GetStockObject(BLACK_PEN));
+    SetLastError(0);
+    i = GetObjectA(hp, (INT_PTR)buff, (LPVOID)sizeof(buff));
+    ok (!i && GetLastError() == ERROR_NOACCESS,
+        "GetObject(invalid buff), expected 0, ERROR_NOACCESS, got %d, %u\n",
+    i, GetLastError());
+
     /* GetObjectType does SetLastError() on a null object */
     SetLastError(0);
     i = GetObjectType(NULL);