linux-kernel - Re: [PATCH] brcmfmac: Do not crash if platform data is not populated

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Date:	Tue, 23 Dec 2014 16:37:21 +0100
From:	Arend van Spriel <arend@...adcom.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	<linux-wireless@...r.kernel.org>,
	Brett Rudley <brudley@...adcom.com>,
	Hante Meuleman <meuleman@...adcom.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	"John W. Linville" <linville@...driver.com>,
	Christophe Prigent <christophe.prigent@...el.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] brcmfmac: Do not crash if platform data is not populated

On 12/23/14 15:48, Mika Westerberg wrote:
> The driver looks for pdata->oob_irq_supported to find out if wowl can be
> supported. However, not all platforms populate pdata in which case we crash
> the kernel because of NULL pointer dereference.

Thanks, Mika

However, this was already reported by Dan Carpenter and I submitted a 
patch for that a couple of days ago: "[PATCH 02/10] brcmfmac: Fix 
possible dereference of NULL pointer." [1].

Regards,
Arend

[1] 
http://mid.gmane.org/1419162233-19492-3-git-send-email-arend@broadcom.com

> Fixes: 330b4e4be937 ("brcmfmac: Add wowl support for SDIO devices.")
> Reported-by: Christophe Prigent<christophe.prigent@...el.com>
> Signed-off-by: Mika Westerberg<mika.westerberg@...ux.intel.com>
> ---
>   drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
> index 3c06e9365949..9880dae2a569 100644
> --- a/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
> +++ b/drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
> @@ -1070,7 +1070,7 @@ static int brcmf_ops_sdio_probe(struct sdio_func *func,
>   	 */
>   	if ((sdio_get_host_pm_caps(sdiodev->func[1])&  MMC_PM_KEEP_POWER)&&
>   	((sdio_get_host_pm_caps(sdiodev->func[1])&  MMC_PM_WAKE_SDIO_IRQ) ||
> -	     (sdiodev->pdata->oob_irq_supported)))
> +	     (sdiodev->pdata&&  sdiodev->pdata->oob_irq_supported)))
>   		bus_if->wowl_supported = true;
>   #endif
>
> @@ -1167,7 +1167,7 @@ static int brcmf_ops_sdio_resume(struct device *dev)
>   	struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
>
>   	brcmf_dbg(SDIO, "Enter\n");
> -	if (sdiodev->pdata->oob_irq_supported)
> +	if (sdiodev->pdata&&  sdiodev->pdata->oob_irq_supported)
>   		disable_irq_wake(sdiodev->pdata->oob_irq_nr);
>   	brcmf_sdio_wd_timer(sdiodev->bus, BRCMF_WD_POLL_MS);
>   	atomic_set(&sdiodev->suspend, false);

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