bug#9273: 23.3; malloc initialization should (sometimes) happen at runtime

[Ken Brown <kbrown@cornell.edu>]

On 8/13/2011 10:41 AM, Eli Zaretskii wrote:
>> Date: Sat, 13 Aug 2011 09:48:52 -0400
>> From: Ken Brown<kbrown@cornell.edu>
>> CC: "9273@debbugs.gnu.org"<9273@debbugs.gnu.org>
>>
>> _heapinfo is indeed consistent with the current heap.  But the pointer
>> that was passed to realloc points into the old heap.  So applying BLOCK
>> to that pointer yields an absurd result.  I can easily catch such cases
>> by testing for ptr<  _heapbase, as in my patch to _free_internal_nolock,
>> but I have to figure out the best way to handle them once I've caught
>> them.
>
> malloc a buffer, then copy the contents of the old one to the new
> one.  You will have to know the size of the old block, which means you
> will have to access the old copy of _heapinfo.

Thanks!  That's much easier than what I was trying to do.

Ken