Re: [lwip-devel] Bug in core/mem.c

[Dirk Ziegelmeier]

Now there is :-)

https://savannah.nongnu.org/bugs/index.php?53680

Ciao
Dirk

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Dirk Ziegelmeier * address@hidden * http://www.ziegelmeier.net

On Tue, Apr 17, 2018 at 7:17 PM, Jason White <address@hidden> wrote:

Is there a bug filed for this?

-----Original Message-----
From: lwip-devel <lwip-devel-bounces+jasonw=wrcaddress@hidden> On Behalf Of Matthias Pfaller
Sent: Tuesday, April 17, 2018 8:00 AM
To: address@hidden
Subject: [lwip-devel] Bug in core/mem.c

Hi,

I just tracked down a bug in mem.c that leads to sporadic memory corruption when LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is active.

I think lfree needs to be declared volatile (static struct mem * volatile lfree). Otherwise the compiler might use the old value of lfree at the top of the for-loop in mem_malloc.

regards, Matthias
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Matthias Pfaller                          Software Entwicklung
marco Systemanalyse und Entwicklung GmbH  Tel   +49 8131 5161 41
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http://www.marco.de/                      Email address@hidden
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