linux-kernel - Re: [PATCH] power: supply: bq2415x: check for NULL acpi

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Message-ID: <20170121000220.GI32502@pali>
Date:   Sat, 21 Jan 2017 01:02:20 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] power: supply: bq2415x: check for NULL acpi_id to avoid
 null pointer dereference

On Friday 20 January 2017 13:25:06 Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> acpi_match_device can potentially return NULL, so it is prudent to
> check if acpi_id is null before it is dereferenced.  Add a check
> and an error message to indicate the failure.
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/power/supply/bq2415x_charger.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/power/supply/bq2415x_charger.c b/drivers/power/supply/bq2415x_charger.c
> index 73e2f0b..c4770a9 100644
> --- a/drivers/power/supply/bq2415x_charger.c
> +++ b/drivers/power/supply/bq2415x_charger.c
> @@ -1569,6 +1569,11 @@ static int bq2415x_probe(struct i2c_client *client,
>  		acpi_id =
>  			acpi_match_device(client->dev.driver->acpi_match_table,
>  					  &client->dev);
> +		if (!acpi_id) {
> +			dev_err(&client->dev, "failed to match device name\n");
> +			ret = -ENODEV;
> +			goto error_1;
> +		}
>  		name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num);
>  	}
>  	if (!name) {

Looks good! Add my Reviewed-by.

-- 
Pali Rohár
pali.rohar@...il.com