netdev - Re: [net PATCH] net: dsa: qca8k: fix NULL pointer dereference for of_device_get_match

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Message-ID: <63162ae8.050a0220.8ac07.db3e@mx.google.com>
Date:   Mon, 5 Sep 2022 18:59:18 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net PATCH] net: dsa: qca8k: fix NULL pointer dereference for
 of_device_get_match_data

On Mon, Sep 05, 2022 at 07:50:39PM +0300, Vladimir Oltean wrote:
> On Sun, Sep 04, 2022 at 11:53:19PM +0200, Christian Marangi wrote:
> > of_device_get_match_data is called on priv->dev before priv->dev is
> > actually set. Move of_device_get_match_data after priv->dev is correctly
> > set to fix this kernel panic.
> > 
> > Fixes: 3bb0844e7bcd ("net: dsa: qca8k: cache match data to speed up access")
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> 
> Did this ever work? Was it tested when you sent the big refactoring
> patch set?

I have to be honest here. I feel really embarrassed about this.
The short story is that the refactor was tested on Openwrt with 5.15 by
manually applying the changes. This fix was applied there but I forgot
to put it in the final series.

I notice this mistake only now that I'm backporting patches and the
manually applied fix was reset.

Again I'm really sorry.

-- 
	Ansuel