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@xxxxxxxxxx>
Looks good:
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
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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