From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: benh@kernel.crashing.org, paulus@samba.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH v2] powerpc/mpc5xxx: Avoid dereferencing potentially freed memory
Date: Fri, 16 Oct 2015 08:20:13 +0200 [thread overview]
Message-ID: <5620971D.8040103@wanadoo.fr> (raw)
In-Reply-To: <1444890977.5970.4.camel@ellerman.id.au>
Le 15/10/2015 08:36, Michael Ellerman a écrit :
> On Thu, 2015-10-15 at 07:56 +0200, Christophe JAILLET wrote:
>> Use 'of_property_read_u32()' instead of 'of_get_property()'+pointer
>> dereference in order to avoid access to potentially freed memory.
>>
>> Use 'of_get_next_parent()' to simplify the while() loop and avoid the
>> need of a temp variable.
>>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
>> ---
>> v2: Use of_property_read_u32 instead of of_get_property+pointer dereference
>> *** Untested ***
> Thanks.
>
> Can someone with an mpc5xxx test this?
>
> cheers
>
Hi,
I don't think it is an issue, but while looking at another similar
patch, I noticed that the proposed patch adds a call to be32_to_cpup()
(within of_property_read_u32).
Apparently, powerPC is a BE architecture, so this call should be a no-op.
Just wanted to point it out, in case of.
Best regards,
CJ
next prev parent reply other threads:[~2015-10-16 6:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-11 20:27 [PATCH] powerpc/mpc5xxx: Use of_get_next_parent to simplify code Christophe JAILLET
2015-10-11 20:44 ` Julia Lawall
2015-10-12 5:05 ` Christophe JAILLET
2015-10-14 4:00 ` Michael Ellerman
2015-10-15 5:56 ` [PATCH v2] powerpc/mpc5xxx: Avoid dereferencing potentially freed memory Christophe JAILLET
2015-10-15 6:36 ` Michael Ellerman
2015-10-16 6:20 ` Christophe JAILLET [this message]
2015-10-16 7:15 ` Gabriel Paubert
2015-10-16 9:49 ` Michael Ellerman
2015-10-16 20:05 ` Christophe JAILLET
2015-10-19 4:38 ` Michael Ellerman
2015-10-15 11:11 ` powerpc/mpc5xxx: Use of_get_next_parent to simplify code Michael Ellerman
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