netdev - Re: [PATCH] can: flexcan: fix NULL pointer exception during bringup

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Date:   Tue, 22 Jan 2019 11:38:43 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     netdev@...r.kernel.org, linux-stable <stable@...r.kernel.org>,
        linux-can@...r.kernel.org, kernel@...gutronix.de,
        davem@...emloft.net,
        Alexander Stein <alexander.stein@...tec-electronic.com>
Subject: Re: [PATCH] can: flexcan: fix NULL pointer exception during bringup

On 1/11/19 12:20 PM, Uwe Kleine-König wrote:
> Commit cbffaf7aa09e ("can: flexcan: Always use last mailbox for TX")
> introduced a loop letting i run up to (including) ARRAY_SIZE(regs->mb)
> and in the body accessed regs->mb[i] which is an out-of-bounds array
> access that then resulted in an access to an reserved register area.
> 
> Later this was changed by commit 0517961ccdf1 ("can: flexcan: Add
> provision for variable payload size") to iterate a bit differently but
> still runs one iteration too much resulting to call
> 
> 	flexcan_get_mb(priv, priv->mb_count)
> 
> which results in a WARN_ON and then a NULL pointer exception. This
> only affects devices compatible with "fsl,p1010-flexcan",
> "fsl,imx53-flexcan", "fsl,imx35-flexcan", "fsl,imx25-flexcan",
> "fsl,imx28-flexcan", so newer i.MX SoCs are not affected.
> 
> Fixes: cbffaf7aa09e ("can: flexcan: Always use last mailbox for TX")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Applied to linux-can

Tnx,
Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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