linux-kernel - Re: [PATCH v3] clk/ti/adpll: allocate room for terminating null

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Message-ID: <20191021143110.GT5610@atomide.com>
Date:   Mon, 21 Oct 2019 07:31:10 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Stephen Kitt <steve@....org>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Tero Kristo <t-kristo@...com>, linux-clk@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] clk/ti/adpll: allocate room for terminating null

* Stephen Kitt <steve@....org> [191019 14:07]:
> The buffer allocated in ti_adpll_clk_get_name doesn't account for the
> terminating null. This patch switches to devm_kasprintf to avoid
> overflowing.
> 
> Signed-off-by: Stephen Kitt <steve@....org>
> ---
> Changes since v2:
>   - Move "adpll" into the format string and drop base_name entirely.
> 
> Changes since v1:
>   - Use devm_kasprintf instead of manually allocating the target
>     buffer.

Acked-by: Tony Lindgren <tony@...mide.com>

> ---
>  drivers/clk/ti/adpll.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/clk/ti/adpll.c b/drivers/clk/ti/adpll.c
> index fdfb90058504..bb2f2836dab2 100644
> --- a/drivers/clk/ti/adpll.c
> +++ b/drivers/clk/ti/adpll.c
> @@ -194,15 +194,8 @@ static const char *ti_adpll_clk_get_name(struct ti_adpll_data *d,
>  		if (err)
>  			return NULL;
>  	} else {
> -		const char *base_name = "adpll";
> -		char *buf;
> -
> -		buf = devm_kzalloc(d->dev, 8 + 1 + strlen(base_name) + 1 +
> -				    strlen(postfix), GFP_KERNEL);
> -		if (!buf)
> -			return NULL;
> -		sprintf(buf, "%08lx.%s.%s", d->pa, base_name, postfix);
> -		name = buf;
> +		name = devm_kasprintf(d->dev, GFP_KERNEL, "%08lx.adpll.%s",
> +				      d->pa, postfix);
>  	}
>  
>  	return name;
> -- 
> 2.20.1
>