linux-kernel - Re: [PATCH] dmaengine: imx-sdma: fix regression with uart scripts

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Message-ID: <CAOMZO5CbTUTkoFCKwrpT5h7CfHxbLtci1qAtMwkAi_LD_5yeyQ@mail.gmail.com>
Date:   Thu, 7 Apr 2022 22:23:03 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Kevin Groeneveld <kgroeneveld@...brook.com>
Cc:     Vinod Koul <vkoul@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Robin Gong <yibin.gong@....com>, dmaengine@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: imx-sdma: fix regression with uart scripts

Hi Kevin,

On Wed, Apr 6, 2022 at 7:48 PM Kevin Groeneveld
<kgroeneveld@...brook.com> wrote:
>
> Commit b98ce2f4e32b ("dmaengine: imx-sdma: add uart rom script") broke
> uart rx on imx5 when using sdma firmware from older Freescale 2.6.35
> kernel. In this case reading addr->uartXX_2_mcu_addr was going out of
> bounds of the firmware memory and corrupting the uart script addresses.
>
> Simply adding a bounds check before accessing addr->uartXX_2_mcu_addr
> does not work as the uartXX_2_mcu_addr members are now beyond the size
> of the older firmware and the uart addresses would never be populated
> in that case. There are other ways to fix this but overall the logic
> seems clearer to me to revert the uartXX_2_mcu_ram_addr structure
> entries back to uartXX_2_mcu_addr, change the newer entries to
> uartXX_2_mcu_rom_addr and update the logic accordingly.
>
> Fixes: b98ce2f4e32b ("dmaengine: imx-sdma: add uart rom script")
> Signed-off-by: Kevin Groeneveld <kgroeneveld@...brook.com>

Thanks for the fix:

Reviewed-by: Fabio Estevam <festevam@...il.com>