linux-kernel - Re: [PATCH] CHROMIUM: mwifiex: fix NULL pointer dereference error

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Date:	Wed, 30 Mar 2016 18:09:29 +0800
From:	Wei-Ning Huang <wnhuang@...gle.com>
To:	Linux Wireless <linux-wireless@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Daniel Kurtz <djkurtz@...omium.org>, snanda@...omium.org,
	Amitkumar Karwar <akarwar@...vell.com>,
	Wei-Ning Huang <wnhuang@...omium.org>
Subject: Re: [PATCH] CHROMIUM: mwifiex: fix NULL pointer dereference error

Sorry, please ignore this one. I forgot to strip the CHROMIUM: tag.

Wei-Ning

On Wed, Mar 30, 2016 at 6:08 PM, Wei-Ning Huang <wnhuang@...omium.org> wrote:
> In mwifiex_enable_hs, we need to check if
> priv->wdev.wiphy->wowlan_config is NULL before accessing it's member.
> This sometimes cause kernel panic when suspend/resume.
>
> Signed-off-by: Wei-Ning Huang <wnhuang@...omium.org>
> ---
>  drivers/net/wireless/marvell/mwifiex/sta_ioctl.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
> index d5c56eb..d8de432 100644
> --- a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
> +++ b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c
> @@ -509,7 +509,8 @@ int mwifiex_enable_hs(struct mwifiex_adapter *adapter)
>
>         if (priv && priv->sched_scanning) {
>  #ifdef CONFIG_PM
> -               if (!priv->wdev.wiphy->wowlan_config->nd_config) {
> +               if (priv->wdev.wiphy->wowlan_config &&
> +                   !priv->wdev.wiphy->wowlan_config->nd_config) {
>  #endif
>                         mwifiex_dbg(adapter, CMD, "aborting bgscan!\n");
>                         mwifiex_stop_bg_scan(priv);
> --
> 2.1.2
>



-- 
Wei-Ning Huang, 黃偉寧 | Software Engineer, Google Inc., Taiwan |
wnhuang@...gle.com | Cell: +886 910-380678