linux-kernel - Re: [PATCH] Input: st-keyscan - fix potential zalloc NULL dereference

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Date:   Tue, 12 Feb 2019 15:28:22 +0000
From:   Gabriel FERNANDEZ <gabriel.fernandez@...com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre TORGUE" <alexandre.torgue@...com>
CC:     "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Input: st-keyscan - fix potential zalloc NULL dereference

Sorry ignore this patch (bad mailing list)

Best Regard

Gabriel

On 2/12/19 4:24 PM, gabriel.fernandez@...com wrote:
> From: Gabriel Fernandez <gabriel.fernandez@...com>
>
> This patch fixes the following static checker warning:
>
> drivers/input/keyboard/st-keyscan.c:156 keyscan_probe()
> error: potential zalloc NULL dereference: 'keypad_data->input_dev'
>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
> ---
>   drivers/input/keyboard/st-keyscan.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/input/keyboard/st-keyscan.c b/drivers/input/keyboard/st-keyscan.c
> index babcfb165e4f..3b85631fde91 100644
> --- a/drivers/input/keyboard/st-keyscan.c
> +++ b/drivers/input/keyboard/st-keyscan.c
> @@ -153,6 +153,8 @@ static int keyscan_probe(struct platform_device *pdev)
>   
>   	input_dev->id.bustype = BUS_HOST;
>   
> +	keypad_data->input_dev = input_dev;
> +
>   	error = keypad_matrix_key_parse_dt(keypad_data);
>   	if (error)
>   		return error;
> @@ -168,8 +170,6 @@ static int keyscan_probe(struct platform_device *pdev)
>   
>   	input_set_drvdata(input_dev, keypad_data);
>   
> -	keypad_data->input_dev = input_dev;
> -
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   	keypad_data->base = devm_ioremap_resource(&pdev->dev, res);
>   	if (IS_ERR(keypad_data->base))