linux-kernel - Re: [PATCH v2] powerpc/32: fix csum_partial_copy

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Message-ID: <20160802124118.GA10155@gate.crashing.org>
Date:	Tue, 2 Aug 2016 07:41:18 -0500
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Christophe Leroy <christophe.leroy@....fr>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Scott Wood <oss@...error.net>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, stable@...r.kernel.org,
	antoine.blangy@....fr
Subject: Re: [PATCH v2] powerpc/32: fix csum_partial_copy_generic()

On Tue, Aug 02, 2016 at 10:07:05AM +0200, Christophe Leroy wrote:
> commit 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic()
> based on copy_tofrom_user()") introduced a bug when destination
> address is odd and initial csum is not null
> 
> In that (rare) case the initial csum value has to be rotated one byte
> as well as the resulting value is
> 
> This patch also fixes related comments
> 
> Fixes: 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic()
> based on copy_tofrom_user()")
> Cc: stable@...r.kernel.org
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  v2: updated comments as suggested by Segher

Thanks.  It looks good to me now.


Segher