[Bug 3637] QVMs are allowed to dereference NULL

[bugzilla-daemon at icculus.org]

http://bugzilla.icculus.org/show_bug.cgi?id=3637





------- Comment #5 from amanieu at gmail.com  2008-07-11 05:40 EDT -------
(In reply to comment #0)
> Quake's virtual machines seem to allow both writing to and
> reading from NULL without any obvious side-effects.

There is a side effect to reading and writing to NULL. In qvms NULL will point
to the begining of the data segment, which is the vmCvar_t memory at the
begining of {g|cg|ui}_main.c. A simple way to fix this would be to allocate a 0
filled buffer right at the begining of the data section.


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