linux-kernel - Re: [PATCH] phy: Variable "val" in function miphy_osc_is

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Message-ID: <a5bf0f11-3428-92de-e37a-96cce1952b36@st.com>
Date:   Wed, 6 Feb 2019 08:39:46 +0000
From:   Patrice CHOTARD <patrice.chotard@...com>
To:     Yizhuo <yzhai003@....edu>
CC:     "csong@...ucr.edu" <csong@...ucr.edu>,
        "zhiyunq@...ucr.edu" <zhiyunq@...ucr.edu>,
        Kishon Vijay Abraham I <kishon@...com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: Variable "val" in function miphy_osc_is_ready()
 could be uninitialized

Hi Yizhuo

On 2/6/19 4:30 AM, Yizhuo wrote:
> In function miphy_osc_is_ready(), local variable "val"
> could be uninitalized. if function regmap_read() returns
> -EINVAL. However, this value is used in if statement.
> This is potentially unsafe.
> 
> Signed-off-by: Yizhuo <yzhai003@....edu>
> ---
>  drivers/phy/st/phy-miphy28lp.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/phy/st/phy-miphy28lp.c b/drivers/phy/st/phy-miphy28lp.c
> index 213e2e15339c..40c7c0a611a0 100644
> --- a/drivers/phy/st/phy-miphy28lp.c
> +++ b/drivers/phy/st/phy-miphy28lp.c
> @@ -835,7 +835,8 @@ static int miphy_osc_is_ready(struct miphy28lp_phy *miphy_phy)
>  {
>  	struct miphy28lp_dev *miphy_dev = miphy_phy->phydev;
>  	unsigned long finish = jiffies + 5 * HZ;
> -	u32 val;
> +	u32 val = 0;
> +	int ret;
>  
>  	if (!miphy_phy->osc_rdy)
>  		return 0;
> @@ -844,8 +845,10 @@ static int miphy_osc_is_ready(struct miphy28lp_phy *miphy_phy)
>  		return -EINVAL;
>  
>  	do {
> -		regmap_read(miphy_dev->regmap,
> +		ret = regmap_read(miphy_dev->regmap,
>  				miphy_phy->syscfg_reg[SYSCFG_STATUS], &val);
> +		if (ret)
> +			return ret;
>  
>  		if ((val & MIPHY_OSC_RDY) != MIPHY_OSC_RDY)
>  			cpu_relax();
> 

Reviewed-by: Patrice Chotard <patrice.chotard@...com>

Thanks