[En-Nut-Discussion] FYI: Bug in ICMP destination unreachable handling fixed

Coleman Brumley cbrumley at polarsoft.biz
Mon Sep 28 16:08:34 CEST 2015


Can you please post the patch here as well?


> -----Original Message-----
> From: en-nut-discussion-bounces at egnite.de [mailto:en-nut-discussion-
> bounces at egnite.de] On Behalf Of Ole Reinhardt
> Sent: Monday, September 28, 2015 7:57 AM
> To: Ethernut User Chat (English) <en-nut-discussion at egnite.de>
> Subject: [En-Nut-Discussion] FYI: Bug in ICMP destination unreachable
> handling fixed
> Hi all,
> in SVN trunk r6135 I fix a bug in the handling of ICMP code 3 messages
> (destination unreachable). It was caused by missing parenthesis in pointer
> arithmetic.
> As result, NutTcpFindSocket() (in NutIcmpUnreach()) was fed with invalid
> data. In worst case this could have led to sockets beeing abborting
> in most cases nothing happened at all, as no matching socket could be
> But even worse, this bug also could result in crashes, if the pointer
> resulted in a read out of the physical memory bounds.
> It might be a good idea to update Nut/OS in your projects which rely on a
> correct ICMP handling.
> Best regards,
> Ole
> --
> kernel concepts GmbH            Tel: +49-271-771091-14
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