linux-kernel - Re: [PATCH] platform/x86: huawei-wmi: Fix a possible NULL deref

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Date:   Fri, 27 Dec 2019 00:54:18 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ayman Bagabas <ayman.bagabas@...il.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mattias Jacobsson <2pi@....nu>,
        kbuild test robot <lkp@...el.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: huawei-wmi: Fix a possible NULL deref

On Wed, Dec 25, 2019 at 06:58:38PM -0500, Ayman Bagabas wrote:
> We're iterating over a NULL terminated array.

This changelog is kind of messed up.  This is how it looks in context:
https://marc.info/?l=linux-kernel&m=157731837511760&w=2
The subject and the commit message are far apart.  What's wrong with
iterating over a NULL terminated array?  The changelog doesn't say which
variable is NULL.

> 
> Fixes: 1ac9abeb2e5b ("platform/x86: huawei-wmi: Move to platform driver")
> Signed-off-by: Ayman Bagabas <ayman.bagabas@...il.com>
> ---
>  drivers/platform/x86/huawei-wmi.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
> index a2d846c4a7ee..42d461eeeff4 100644
> --- a/drivers/platform/x86/huawei-wmi.c
> +++ b/drivers/platform/x86/huawei-wmi.c
> @@ -784,13 +784,13 @@ static const struct wmi_device_id huawei_wmi_events_id_table[] = {
>  static int huawei_wmi_probe(struct platform_device *pdev)
>  {
>  	const struct wmi_device_id *guid = huawei_wmi_events_id_table;
> +	struct input_dev *idev = *huawei_wmi->idev;

This line seems like an unrelated change.  I'm still not sure the
justification for this.  I really hate puzzling over patches to try
figure out why a patch is making changes.

regards,
dan carpenter