If there is no draw buffer then buffer pointer gets freed in
wined3d_buffer_decref() via d3d9_vertexbuffer_wined3d_parent_ops
and consequent check for buffer->draw_buffer results in freed
memory access.
Signed-off-by: Paul Gofman <gofmanp@gmail.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>