netdev - Re: [PATCH] b43legacy: Add checking for null for ssb_get

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Date:   Fri, 10 Feb 2023 13:17:12 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Natalia Petrova <n.petrova@...tech.ru>
Cc:     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>,
        linux-wireless@...r.kernel.org, b43-dev@...ts.infradead.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] b43legacy: Add checking for null for
 ssb_get_devtypedata(dev)

On 2/10/23 05:12, Natalia Petrova wrote:
> Function ssb_get_devtypedata(dev) may return null (next call
> B43legacy_WARN_ON(!wl) is used for error handling, including null-value).
> Therefore, a check is added before calling b43legacy_wireless_exit(),
> where the argument containing this value is expected to be dereferenced.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE
> 
> Fixes: 75388acd0cd8 ("[B43LEGACY]: add mac80211-based driver for legacy BCM43xx devices")
> Signed-off-by: Natalia Petrova <n.petrova@...tech.ru>
> ---
>   drivers/net/wireless/broadcom/b43legacy/main.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/broadcom/b43legacy/main.c b/drivers/net/wireless/broadcom/b43legacy/main.c
> index 760136638a95..1ae65679d704 100644
> --- a/drivers/net/wireless/broadcom/b43legacy/main.c
> +++ b/drivers/net/wireless/broadcom/b43legacy/main.c
> @@ -3871,7 +3871,7 @@ static int b43legacy_probe(struct ssb_device *dev,
>   	return err;
>   
>   err_wireless_exit:
> -	if (first)
> +	if (first && wl)
>   		b43legacy_wireless_exit(dev, wl);
>   	return err;
>   }

Looks good to me.

Acked-by: Larry Finger <Larry.Finger@...il.com>

Thanks,

Larry