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

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Message-ID: <CA+icZUV7+1XqYcpnppopYOesqeZe_Ne6Taew=tZSbra41aEiYQ@mail.gmail.com>
Date:	Wed, 30 Mar 2016 12:40:55 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Wei-Ning Huang <wnhuang@...gle.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

On Wed, Mar 30, 2016 at 12:38 PM, Wei-Ning Huang <wnhuang@...gle.com> wrote:
> ah.. thanks.
>
> Kalle, can you help amend the message if this patch is accepted?
> Thanks a lot.
>

http://its-not-its.info/

- Sedat -

> 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