linux-kernel - Re: [patch v2 1/2] pinctrl: samsung: don't truncate the last char

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Date:	Tue, 23 Jun 2015 08:51:27 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Thomas Abraham <thomas.abraham@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kukjin Kim <kgene@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch v2 1/2] pinctrl: samsung: don't truncate the last char

On 23.06.2015 00:12, Dan Carpenter wrote:
> We were allocating enough space because sizeof("-grp") and
> sizeof("-mux") are both equal to 5 but in the snprintf() we only allowed
> for 4 characters so the last 'p' and 'x' characters were truncated.
> 
> The allocate and sprintf can be done in one step with the kasprintf().
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Looks good:
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof


> 
> diff --git a/drivers/pinctrl/samsung/pinctrl-exynos5440.c b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
> index f5619fb..fa84db6 100644
> --- a/drivers/pinctrl/samsung/pinctrl-exynos5440.c
> +++ b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
> @@ -44,9 +44,7 @@
>  #define PIN_NAME_LENGTH		10
>  
>  #define GROUP_SUFFIX		"-grp"
> -#define GSUFFIX_LEN		sizeof(GROUP_SUFFIX)
>  #define FUNCTION_SUFFIX		"-mux"
> -#define FSUFFIX_LEN		sizeof(FUNCTION_SUFFIX)
>  
>  /*
>   * pin configuration type and its value are packed together into a 16-bits.
> @@ -215,12 +213,11 @@ static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
>  	 * Allocate memory for pin group name. The pin group name is derived
>  	 * from the node name from which these map entries are be created.
>  	 */
> -	gname = kzalloc(strlen(np->name) + GSUFFIX_LEN, GFP_KERNEL);
> +	gname = kasprintf(GFP_KERNEL, "%s%s", np->name, GROUP_SUFFIX);
>  	if (!gname) {
>  		dev_err(dev, "failed to alloc memory for group name\n");
>  		goto free_map;
>  	}
> -	snprintf(gname, strlen(np->name) + 4, "%s%s", np->name, GROUP_SUFFIX);
>  
>  	/*
>  	 * don't have config options? then skip over to creating function
> @@ -254,13 +251,12 @@ static int exynos5440_dt_node_to_map(struct pinctrl_dev *pctldev,
>  skip_cfgs:
>  	/* create the function map entry */
>  	if (of_find_property(np, "samsung,exynos5440-pin-function", NULL)) {
> -		fname = kzalloc(strlen(np->name) + FSUFFIX_LEN,	GFP_KERNEL);
> +		fname = kasprintf(GFP_KERNEL,
> +				  "%s%s", np->name, FUNCTION_SUFFIX);
>  		if (!fname) {
>  			dev_err(dev, "failed to alloc memory for func name\n");
>  			goto free_cfg;
>  		}
> -		snprintf(fname, strlen(np->name) + 4, "%s%s", np->name,
> -			 FUNCTION_SUFFIX);
>  
>  		map[*nmaps].data.mux.group = gname;
>  		map[*nmaps].data.mux.function = fname;
> @@ -710,14 +706,12 @@ static int exynos5440_pinctrl_parse_dt(struct platform_device *pdev,
>  		}
>  
>  		/* derive pin group name from the node name */
> -		gname = devm_kzalloc(dev, strlen(cfg_np->name) + GSUFFIX_LEN,
> -					GFP_KERNEL);
> +		gname = devm_kasprintf(dev, GFP_KERNEL,
> +				       "%s%s", cfg_np->name, GROUP_SUFFIX);
>  		if (!gname) {
>  			dev_err(dev, "failed to alloc memory for group name\n");
>  			return -ENOMEM;
>  		}
> -		snprintf(gname, strlen(cfg_np->name) + 4, "%s%s", cfg_np->name,
> -			 GROUP_SUFFIX);
>  
>  		grp->name = gname;
>  		grp->pins = pin_list;
> @@ -731,14 +725,12 @@ skip_to_pin_function:
>  			continue;
>  
>  		/* derive function name from the node name */
> -		fname = devm_kzalloc(dev, strlen(cfg_np->name) + FSUFFIX_LEN,
> -					GFP_KERNEL);
> +		fname = devm_kasprintf(dev, GFP_KERNEL,
> +				       "%s%s", cfg_np->name, FUNCTION_SUFFIX);
>  		if (!fname) {
>  			dev_err(dev, "failed to alloc memory for func name\n");
>  			return -ENOMEM;
>  		}
> -		snprintf(fname, strlen(cfg_np->name) + 4, "%s%s", cfg_np->name,
> -			 FUNCTION_SUFFIX);
>  
>  		func->name = fname;
>  		func->groups = devm_kzalloc(dev, sizeof(char *), GFP_KERNEL);
> 

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