linux-kernel - Re: [PATCH AUTOSEL 5.8 28/29] spi: fsl-dspi: fix use-after-free in remove path

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Message-ID: <20201004125804.GL2415204@sasha-vm>
Date:   Sun, 4 Oct 2020 08:58:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.8 28/29] spi: fsl-dspi: fix use-after-free in
 remove path

On Tue, Sep 29, 2020 at 08:22:16AM +0200, Sascha Hauer wrote:
>Hi Sasha,
>
>On Mon, Sep 28, 2020 at 09:30:25PM -0400, Sasha Levin wrote:
>> From: Sascha Hauer <s.hauer@...gutronix.de>
>>
>> [ Upstream commit 530b5affc675ade5db4a03f04ed7cd66806c8a1a ]
>>
>> spi_unregister_controller() not only unregisters the controller, but
>> also frees the controller. This will free the driver data with it, so
>> we must not access it later dspi_remove().
>>
>> Solve this by allocating the driver data separately from the SPI
>> controller.
>>
>> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
>> Link: https://lore.kernel.org/r/20200923131026.20707-1-s.hauer@pengutronix.de
>> Signed-off-by: Mark Brown <broonie@...nel.org>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  drivers/spi/spi-fsl-dspi.c | 12 +++++++-----
>>  1 file changed, 7 insertions(+), 5 deletions(-)
>
>This patch causes a regression and shouldn't be applied without the fix
>in https://lkml.org/lkml/2020/9/28/300.

Looks like the fix didn't make it yet, so I'll drop the patch.

-- 
Thanks,
Sasha