linux-kernel - Re: [PATCH] spi: core: Fix Oops in spi_pump

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Message-ID: <20140218073712.GA3142@lukather>
Date:	Tue, 18 Feb 2014 08:37:12 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Mark Brown <broonie@...nel.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	shuge@...winnertech.com, zhuzhenhua@...winnertech.com,
	stable <stable@...r.kernel.org>
Subject: Re: [PATCH] spi: core: Fix Oops in spi_pump_messages error path

Hi Geert,

On Mon, Feb 17, 2014 at 07:02:09PM +0100, Geert Uytterhoeven wrote:
> On Mon, Feb 17, 2014 at 6:20 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > When the generic implementation of the transfer_one_message callback was called
> > by the spi_pump_messages function, if that transfer was to fail, the
> > spi_finalize_current_message was called twice, once in
> > spi_transfer_one_message, and one in spi_pump_messages.
> >
> > This was causing a null pointer dereference in the second call, because the
> > first one set the ->cur_msg field to NULL.
> >
> > Since the SPI framework expect the transfer_one_message callback to call
> > spi_finalize_current_message, we can remove it from spi_pump_messages, together
> > with any dereference of the ->cur_msg pointer.
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > Cc: stable@...r.kernel.org
> 
> Already fixed in v3.14-rc3 in 1f802f8249a0da536877842c43c7204064c4de8b
> ("spi: Fix crash with double message finalisation on error handling").
> 
> There's no need to inform stable, as the problem was introduced in v3.14-rc1.

Oops, totally missed that. Thanks!

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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