linux-kernel - Re: [PATCH net-next v2 1/2] net: phy: mscc: fix signedness bug in vsc85xx_downshift

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Message-ID: <380aac12-05b4-3f77-f583-fb72ec98a8ab@embeddedor.com>
Date:   Tue, 16 Oct 2018 10:51:35 +0200
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Quentin Schulz <quentin.schulz@...tlin.com>
Subject: Re: [PATCH net-next v2 1/2] net: phy: mscc: fix signedness bug in
 vsc85xx_downshift_get

Hi,

On 10/10/18 10:30 AM, Gustavo A. R. Silva wrote:
> Currently, the error handling for the call to function
> phy_read_paged() doesn't work because *reg_val* is of
> type u16 (16 bits, unsigned), which makes it impossible
> for it to hold a value less than 0.
> 
> Fix this by changing the type of variable *reg_val* to int.
> 
> Addresses-Coverity-ID: 1473970 ("Unsigned compared against 0")
> Fixes: 6a0bfbbe20b0 ("net: phy: mscc: migrate to phy_select/restore_page functions")
> Reviewed-by: Quentin Schulz <quentin.schulz@...tlin.com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
> Changes in v2:
>  - Add Quentin's Reviewed-by to the commit log.
> 
>  drivers/net/phy/mscc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
> index bffe077..bff56c3 100644
> --- a/drivers/net/phy/mscc.c
> +++ b/drivers/net/phy/mscc.c
> @@ -522,7 +522,7 @@ static int vsc85xx_mdix_set(struct phy_device *phydev, u8 mdix)
>  
>  static int vsc85xx_downshift_get(struct phy_device *phydev, u8 *count)
>  {
> -	u16 reg_val;
> +	int reg_val;
>  
>  	reg_val = phy_read_paged(phydev, MSCC_PHY_PAGE_EXTENDED,
>  				 MSCC_PHY_ACTIPHY_CNTL);
> 

Friendly ping. Dave, can you take this?

Thanks!
--
Gustavo