Protect some DIB functions from bad inputs.

[Alexandre Julliard]

Rein Klazes <wijn at wanadoo.nl> writes:

> I have no idea why it was not merged, never got any comments. Cc' ed to
> the developers list for suggestions. A re-diffed patch is attached.

IsBadReadPtr is broken and should never be used. You need to add an
exception handler around the actual access.

-- 
Alexandre Julliard
julliard at winehq.org