linux-kernel - Re: [PATCH 4.19 09/72] net: ieee802154: fix a potential NULL pointer dereference

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Date:   Fri, 3 May 2019 10:32:14 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Kangjie Lu <kjlu@....edu>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: Re: [PATCH 4.19 09/72] net: ieee802154: fix a potential NULL pointer
 dereference

On Thu 2019-05-02 17:20:31, Greg Kroah-Hartman wrote:
> [ Upstream commit 2795e8c251614ac0784c9d41008551109f665716 ]
> 
> 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>
> Acked-by: Michael Hennerich <michael.hennerich@...log.com>
> Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
> Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>

> 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;
> +	}
>

This does ieee802154_free_hw(lp->hw) before adf7242_hw_init(). I don't
think that's correct.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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