netdev - Re: [PATCH v2 net] net: phy: phylink: fix uninitialized variable in phylink_get_mac

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Date:   Tue, 26 Feb 2019 08:43:13 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     David Miller <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net] net: phy: phylink: fix uninitialized variable in
 phylink_get_mac_state

On Tue, Feb 26, 2019 at 08:25:41AM +0100, Heiner Kallweit wrote:
> When debugging an issue I found implausible values in state->pause.
> Reason in that state->pause isn't initialized and later only single
> bits are changed. Also the struct itself isn't initialized in
> phylink_resolve(). So better initialize state->pause.

mac_link_state() is expected to always set this, but this is safer.

Maybe also set state->speed to SPEED_UNKNOWN, state->duplex to
DUPLEX_UNKNOWN and state->an_complete to zero?

> 
> v2:
> - use right function name in subject
> 
> Fixes: 9525ae83959b ("phylink: add phylink infrastructure")
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/phy/phylink.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 59d175a5b..a9954c205 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -324,6 +324,7 @@ static int phylink_get_mac_state(struct phylink *pl, struct phylink_link_state *
>  	linkmode_zero(state->lp_advertising);
>  	state->interface = pl->link_config.interface;
>  	state->an_enabled = pl->link_config.an_enabled;
> +	state->pause = MLO_PAUSE_NONE;
>  	state->link = 1;
>  
>  	return pl->ops->mac_link_state(ndev, state);
> -- 
> 2.20.1
> 
> 

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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