linux-kernel - Re: [PATCH v2] b43legacy: Add checking for null for ssb_get

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Message-ID: <20230422192820.59e8e423@barney>
Date:   Sat, 22 Apr 2023 19:28:20 +0200
From:   Michael Büsch <m@...s.ch>
To:     Larry Finger <Larry.Finger@...inger.net>
Cc:     Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "John W. Linville" <linville@...driver.com>,
        linux-wireless@...r.kernel.org, b43-dev@...ts.infradead.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org,
        Natalia Petrova <n.petrova@...tech.ru>
Subject: Re: [PATCH v2] b43legacy: Add checking for null for
 ssb_get_devtypedata(dev)

On Fri, 21 Apr 2023 17:14:18 -0500
Larry Finger <Larry.Finger@...inger.net> wrote:
> > (err) goto out;
> >   		wl = ssb_get_devtypedata(dev);
> > -		B43legacy_WARN_ON(!wl);
> > +		if (!wl) {
> > +			B43legacy_WARN_ON(!wl);
> > +			err = -ENODEV;
> > +			goto out;
> > +		}
> >   	}
> >   	err = b43legacy_one_core_attach(dev, wl);
> >   	if (err)  
> 
> I do not recall seeing v1. One additional nitpick: The latest
> convention would have the subject as "wifi: b43legacy:...". Kalle may
> be able to fix this on merging, but it not, a v3 might be required.
> Otherwise, the patch is good.
> 
> Reviewed-by: Larry Finger <Larry.Finger@...inger.net>

No, it's not good. It's wrong. I already replied to it.
wl can never be NULL here and the goto-out path is wrong (if there
was a chance for it to trigger).

Please drop this patch, Kalle.

-- 
Michael Büsch
https://bues.ch/

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