[Bug 32246] Compiz 0.9 switcher segfaults in mipmap generation code

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https://bugs.freedesktop.org/show_bug.cgi?id=32246

--- Comment #4 from Bryce Harrington <bryce@canonical.com> 2011-02-15 18:02:31 PST ---
Created an attachment (id=43410)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=43410)
0001-Check-for-null-pointer-in-mipmap-image-data.patch

It looks to me like this occurs when the calling application passes in a mipmap
that has undefined image data (e.g. priv-target->Image[0][0]->Data == NULL in
this case).

For the case where _mesa_is_format_compressed() is true, there is an ASSERT to
catch that this is undefined, but there is no such check for the false case.

The attached patch adds such a check (a problem message rather than an
assertion, though).  Possibly it should be using _mesa_error() or perhaps an
assert; I'm not certain.

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