Sender: Larry Finger <larry.finger@gmail.com>
Message-ID: <ff977e8e-f832-d38d-a6d8-4510d08bf306@lwfinger.net>
Date:   Fri, 10 Feb 2023 13:17:12 -0600
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Subject: Re: [PATCH] b43legacy: Add checking for null for
 ssb_get_devtypedata(dev)
Content-Language: en-US
To:     Natalia Petrova <n.petrova@fintech.ru>
Cc:     Kalle Valo <kvalo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        linux-wireless@vger.kernel.org, b43-dev@lists.infradead.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        lvc-project@linuxtesting.org
References: <20230210111228.370513-1-n.petrova@fintech.ru>
From:   Larry Finger <Larry.Finger@lwfinger.net>
In-Reply-To: <20230210111228.370513-1-n.petrova@fintech.ru>
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Precedence: bulk

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@fintech.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@gmail.com>

Thanks,

Larry