[Bug libc/14277] Pointer used after free'd

[joseph at codesourcery dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14277

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-06-21 16:21:12 UTC ---
On Thu, 21 Jun 2012, law at redhat dot com wrote:

> I don't have a good testcase -- the one provided to me hasn't tripped in about
> 12 hours of running or in shorter runs with differing values of
> M_MMAP_THRESHOLD and may contain confidential information.   Hopefully the
> analysis above is clear enough to show this code is clearly broken.

Does use of M_PERTURB (to cause free to overwrite freed memory - I don't 
actually know if it works for realloc as well) make it easier to reproduce 
the problem?

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