linux-kernel - Re: [net PATCH] net: phy: qcom: at803x: fix kernel panic with at8031

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Date: Mon, 25 Mar 2024 20:40:51 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	William Wortel <wwortel@...pstraat.com>, stable@...r.kernel.org
Subject: Re: [net PATCH] net: phy: qcom: at803x: fix kernel panic with
 at8031_probe

On Mon, Mar 25, 2024 at 08:06:19PM +0100, Christian Marangi wrote:
> On reworking and splitting the at803x driver, in splitting function of
> at803x PHYs it was added a NULL dereference bug where priv is referenced
> before it's actually allocated and then is tried to write to for the
> is_1000basex and is_fiber variables in the case of at8031, writing on
> the wrong address.
> 
> Fix this by correctly setting priv local variable only after
> at803x_probe is called and actually allocates priv in the phydev struct.
> 
> Reported-by: William Wortel <wwortel@...pstraat.com>
> Cc: <stable@...r.kernel.org>
> Fixes: 25d2ba94005f ("net: phy: at803x: move specific at8031 probe mode check to dedicated probe")
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew