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

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Message-ID: <20190927152315.GE5610@atomide.com>
Date:   Fri, 27 Sep 2019 08:23:15 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Stephen Kitt <steve@....org>
Cc:     Tero Kristo <t-kristo@...com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-omap@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk/ti/adpll: allocate room for terminating null

* Stephen Kitt <steve@....org> [190927 15:13]:
> The buffer allocated in ti_adpll_clk_get_name doesn't account for the
> terminating null. This patch adds the extra byte, and switches to
> snprintf to avoid overflowing.
> 
> Signed-off-by: Stephen Kitt <steve@....org>
> ---
>  drivers/clk/ti/adpll.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/ti/adpll.c b/drivers/clk/ti/adpll.c
> index fdfb90058504..27933c4e8a27 100644
> --- a/drivers/clk/ti/adpll.c
> +++ b/drivers/clk/ti/adpll.c
> @@ -196,12 +196,13 @@ static const char *ti_adpll_clk_get_name(struct ti_adpll_data *d,
>  	} else {
>  		const char *base_name = "adpll";
>  		char *buf;
> +		size_t size = 8 + 1 + strlen(base_name) + 1 +
> +			      strlen(postfix) + 1;
>  
> -		buf = devm_kzalloc(d->dev, 8 + 1 + strlen(base_name) + 1 +
> -				    strlen(postfix), GFP_KERNEL);
> +		buf = devm_kzalloc(d->dev, size, GFP_KERNEL);
>  		if (!buf)
>  			return NULL;
> -		sprintf(buf, "%08lx.%s.%s", d->pa, base_name, postfix);
> +		snprintf(buf, size, "%08lx.%s.%s", d->pa, base_name, postfix);
>  		name = buf;
>  	}
>  

Thanks for catching this. Maybe just use devm_kasprintf() here?

Regards,

Tony