linux-kernel - Re: [PATCH 3/3] input: misc: pm8941-pwrkey: avoid potential null pointer dereference

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Date:   Thu, 20 Jan 2022 14:18:01 -0800
From:   Trilok Soni <quic_tsoni@...cinc.com>
To:     Anjelique Melendez <quic_amelende@...cinc.com>,
        <dmitry.torokhov@...il.com>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <collinsd@...eaurora.org>,
        <bjorn.andersson@...aro.org>, <swboyd@...omium.org>,
        <skakit@...eaurora.org>
Subject: Re: [PATCH 3/3] input: misc: pm8941-pwrkey: avoid potential null
 pointer dereference

On 1/20/2022 12:41 PM, Anjelique Melendez wrote:
> From: David Collins <collinsd@...eaurora.org>
> 
> Add a null check for the pwrkey->data pointer after it is assigned
> in pm8941_pwrkey_probe().  This avoids a potential null pointer
> dereference when pwrkey->data->has_pon_pbs is accessed later in
> the probe function.
> 
> Change-Id: I589c4851e544d79a1863fd110b32a0b45ac03caf
> Signed-off-by: David Collins <collinsd@...eaurora.org>
> Signed-off-by: Anjelique Melendez <quic_amelende@...cinc.com>
> ---
>   drivers/input/misc/pm8941-pwrkey.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/input/misc/pm8941-pwrkey.c b/drivers/input/misc/pm8941-pwrkey.c
> index 0ce00736e695..ac08ed025802 100644
> --- a/drivers/input/misc/pm8941-pwrkey.c
> +++ b/drivers/input/misc/pm8941-pwrkey.c
> @@ -263,6 +263,10 @@ static int pm8941_pwrkey_probe(struct platform_device *pdev)
>   
>   	pwrkey->dev = &pdev->dev;
>   	pwrkey->data = of_device_get_match_data(&pdev->dev);
> +	if (!pwrkey->data) {
> +		dev_err(&pdev->dev, "match data not found\n");
> +		return -ENODEV;
> +	}
>   

I don't understand why this patch is 3rd in the series. Isn't it 
independent from the debounce time? If not, then why it is not fixed as 
part of the patch which adds this debounce time support?

---Trilok Soni