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Re: [ECOS] Re: dlmalloc-2.6.4.c MALLOC_COPY broken?

From: Dave Lawrence <dlawrence at ad-holdings dot co dot uk>
To: ecos-patches at sources dot redhat dot com
Date: Tue, 08 Jan 2008 11:18:32 +0000
Subject: Re: [ECOS] Re: dlmalloc-2.6.4.c MALLOC_COPY broken?
References: <c09652430712310515qe60f9den48383d2d6a18a3a7@mail.gmail.com> <fli8qp$p7n$1@ger.gmane.org> <20080106120732.GG3023@lunn.ch>

Andrew Lunn wrote:

I don't see how this can result in overlapping memory. newptr is a new
block of memory, so it is not possible that it overlaps with ptr.

I agree. Infact it is 2.6.6 that is broken (sorry for the confusion). This version attempts to extend the block forwards or backwards in preference to allocating a completely new block. If the increase in size is less then a factor of two then the resulting copy will overlap.

dlmalloc.cxx in the anon CVS seems to be based on 2.6.6.

Follow-Ups:
- Re: [ECOS] Re: dlmalloc-2.6.4.c MALLOC_COPY broken?
  - From: Dave Lawrence

References:
- Re: [ECOS] Re: dlmalloc-2.6.4.c MALLOC_COPY broken?
  - From: Andrew Lunn

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