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

From: Dan Carpenter
Date: Thu Dec 26 2019 - 17:02:16 EST


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@xxxxxxxxx>
> ---
> 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