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

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Date:	Wed, 30 Mar 2016 18:38:31 +0800
From:	Wei-Ning Huang <wnhuang@...gle.com>
To:	sedat.dilek@...il.com
Cc:	Linux Wireless <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Daniel Kurtz <djkurtz@...omium.org>, snanda@...omium.org,
	Amitkumar Karwar <akarwar@...vell.com>,
	Kalle Valo <kvalo@...eaurora.org>
Subject: Re: [PATCH RESEND] mwifiex: fix NULL pointer dereference error

ah.. thanks.

Kalle, can you help amend the message if this patch is accepted?
Thanks a lot.

Wei-Ning

On Wed, Mar 30, 2016 at 6:26 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Wed, Mar 30, 2016 at 12:14 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.
>
> it's... its member (not it's) :-).
>
> - Sedat -
>
>> 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
>>
>> --
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-- 
Wei-Ning Huang, 黃偉寧 | Software Engineer, Google Inc., Taiwan |
wnhuang@...gle.com | Cell: +886 910-380678