linux-kernel - Re: [PATCH] net: ieee802154: fix a potential NULL pointer dereference

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Date:   Wed, 13 Mar 2019 10:09:02 +0100
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Michael Hennerich <michael.hennerich@...log.com>,
        Alexander Aring <alex.aring@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ieee802154: fix a potential NULL pointer dereference

Hello.

On 11.03.19 08:25, Kangjie Lu wrote:
> In case alloc_ordered_workqueue fails, the fix releases
> sources and returns -ENOMEM to avoid NULL pointer dereference.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/net/ieee802154/adf7242.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ieee802154/adf7242.c b/drivers/net/ieee802154/adf7242.c
> index cd1d8faccca5..cd6b95e673a5 100644
> --- a/drivers/net/ieee802154/adf7242.c
> +++ b/drivers/net/ieee802154/adf7242.c
> @@ -1268,6 +1268,10 @@ static int adf7242_probe(struct spi_device *spi)
>  	INIT_DELAYED_WORK(&lp->work, adf7242_rx_cal_work);
>  	lp->wqueue = alloc_ordered_workqueue(dev_name(&spi->dev),
>  					     WQ_MEM_RECLAIM);
> +	if (unlikely(!lp->wqueue)) {
> +		ret = -ENOMEM;
> +		goto err_hw_init;
> +	}
>  
>  	ret = adf7242_hw_init(lp);
>  	if (ret)
>