netdev - Re: [PATCH net] net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices

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Date:   Thu, 26 Jan 2023 08:21:24 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Andre Kalb <andre.kalb@....de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Felix Riemann <felix.riemann@....de>
Subject: Re: [PATCH net] net: phy: dp83822: Fix null pointer access on
 DP83825/DP83826 devices

On Wed, Jan 25, 2023 at 07:23:26PM +0100, Andre Kalb wrote:
> From: Andre Kalb <andre.kalb@....de>
> 
> The probe() function is only used for the DP83822 PHY, leaving the
> private data pointer uninitialized for the smaller DP83825/26 models.
> While all uses of the private data structure are hidden in 82822 specific
> callbacks, configuring the interrupt is shared across all models.
> This causes a NULL pointer dereference on the smaller PHYs as it accesses
> the private data unchecked. Verifying the pointer avoids that.
> 
> Fixes: 5dc39fd5ef35 ("net: phy: DP83822: Add ability to advertise Fiber connection")
> Signed-off-by: Andre Kalb <andre.kalb@....de>

Reviewed-by: Simon Horman <simon.horman@...igine.com>