linux-kernel - Re: [PATCH v2] input: raspberrypi-ts: Fix refcount leak in rpi_ts

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Date:   Tue, 24 Jan 2023 11:15:47 +0100
From:   Mattijs Korpershoek <mkorpershoek@...libre.com>
To:     Miaoqian Lin <linmq006@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Miaoqian Lin <linmq006@...il.com>,
        Rob Herring <robh@...nel.org>, Eric Anholt <eric@...olt.net>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        linux-input@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] input: raspberrypi-ts: Fix refcount leak in
 rpi_ts_probe

On Fri, Dec 23, 2022 at 11:46, Miaoqian Lin <linmq006@...il.com> wrote:

> rpi_firmware_get() take reference, we need to release it in error paths
> as well. Use devm_rpi_firmware_get() helper to handling the resources.
> Also remove the existing rpi_firmware_put().
>
> Fixes: 0b9f28fed3f7 ("Input: add official Raspberry Pi's touchscreen driver")
> Fixes: 3b8ddff780b7 ("input: raspberrypi-ts: Release firmware handle when not needed")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
> changes in v2:
> - use devm_rpi_firmware_get().
> - remove rpi_firmware_put().

Reviewed-by: Mattijs Korpershoek <mkorpershoek@...libre.com>

> ---
>  drivers/input/touchscreen/raspberrypi-ts.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c
> index 5000f5fd9ec3..45c575df994e 100644
> --- a/drivers/input/touchscreen/raspberrypi-ts.c
> +++ b/drivers/input/touchscreen/raspberrypi-ts.c
> @@ -134,7 +134,7 @@ static int rpi_ts_probe(struct platform_device *pdev)
>  		return -ENOENT;
>  	}
>  
> -	fw = rpi_firmware_get(fw_node);
> +	fw = devm_rpi_firmware_get(&pdev->dev, fw_node);
>  	of_node_put(fw_node);
>  	if (!fw)
>  		return -EPROBE_DEFER;
> @@ -160,7 +160,6 @@ static int rpi_ts_probe(struct platform_device *pdev)
>  	touchbuf = (u32)ts->fw_regs_phys;
>  	error = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
>  				      &touchbuf, sizeof(touchbuf));
> -	rpi_firmware_put(fw);
>  	if (error || touchbuf != 0) {
>  		dev_warn(dev, "Failed to set touchbuf, %d\n", error);
>  		return error;
> -- 
> 2.25.1