linux-kernel - Re: [PATCH v3] MIPS: BCM63xx: Add check for NULL for clk in clk

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Message-ID: <20221209224140.GA4928@alpha.franken.de>
Date:   Fri, 9 Dec 2022 23:41:40 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Anastasia Belova <abelova@...ralinux.ru>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Maxime Bizon <mbizon@...ebox.fr>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH v3] MIPS: BCM63xx: Add check for NULL for clk in
 clk_enable

On Fri, Dec 09, 2022 at 01:05:50PM +0300, Anastasia Belova wrote:
> Check clk for NULL before calling clk_enable_unlocked where clk
> is dereferenced. There is such check in other implementations
> of clk_enable.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
> Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
> ---
> v2: Fix errors reported by kernel test robot <lkp@...el.com>.
> v3: Merge several patches into single one.
>  arch/mips/bcm63xx/clk.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/mips/bcm63xx/clk.c b/arch/mips/bcm63xx/clk.c
> index 6e6756e8fa0a..86a6e2590866 100644
> --- a/arch/mips/bcm63xx/clk.c
> +++ b/arch/mips/bcm63xx/clk.c
> @@ -361,6 +361,8 @@ static struct clk clk_periph = {
>   */
>  int clk_enable(struct clk *clk)
>  {
> +	if (!clk)
> +		return 0;
>  	mutex_lock(&clocks_mutex);
>  	clk_enable_unlocked(clk);
>  	mutex_unlock(&clocks_mutex);
> -- 
> 2.30.2

applied to mips-next.

Thomas.

-- 
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