Re: [PATCH 2.6.28] tcp_ipv6: fix use of uninitialized memory

From: Arnaldo Carvalho de Melo
Date: Fri Sep 12 2008 - 08:54:14 EST

Em Fri, Sep 12, 2008 at 09:05:25AM +0200, Vegard Nossum escreveu:
> >From 6544c4074aa5dde2e3f4d3e02f5601c1c33b770e Mon Sep 17 00:00:00 2001
> From: Vegard Nossum <vegard.nossum@xxxxxxxxx>
> Date: Tue, 9 Sep 2008 07:17:32 +0200
> Subject: [PATCH] tcp_ipv6: fix use of uninitialized memory
> inet6_rsk() is called on a struct request_sock * before we
> have checked whether the socket is an ipv6 socket or a ipv6-
> mapped ipv4 socket. The access that triggers this is the
> inet_rsk(rsk)->inet6_rsk_offset dereference in inet6_rsk().
> This is arguably not a critical error as the inet6_rsk_offset
> is only used to compute a pointer which is never really used
> (in the code path in question) anyway. But it might be a
> latent error, so let's fix it.
> Spotted by kmemcheck.

Humm, so this was poisoned at allocation and then when inet6_rsk_offset
was accessed it noticed, interesting, thanks!

Acked-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

- Arnaldo
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