linux-kernel - Re: [RFC PATCH] Add bridge driver to connect sensors to CIO2 device via software nodes on ACPI platforms

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Date:   Fri, 18 Sep 2020 09:09:37 +0100
From:   Dan Scally <djrscally@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     yong.zhi@...el.com, sakari.ailus@...ux.intel.com,
        bingbu.cao@...el.com, tian.shu.qiu@...el.com, mchehab@...nel.org,
        gregkh@...uxfoundation.org, davem@...emloft.net, robh@...nel.org,
        devel@...verdev.osuosl.org, jorhand@...ux.microsoft.com,
        kieran.bingham@...asonboard.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, kitakar@...il.com
Subject: Re: [RFC PATCH] Add bridge driver to connect sensors to CIO2 device
 via software nodes on ACPI platforms

Ah, shoot - good spot, thanks

On 18/09/2020 09:03, Dan Carpenter wrote:
> I ran Smatch over the code and it spotted an off by one.
>
> On Wed, Sep 16, 2020 at 10:36:18PM +0100, Daniel Scally wrote:
>> +#define MAX_CONNECTED_DEVICES			4
>> +#define SWNODE_SENSOR_HID			0
>> +#define SWNODE_SENSOR_PORT			1
>> +#define SWNODE_SENSOR_ENDPOINT			2
>> +#define SWNODE_CIO2_PORT			3
>> +#define SWNODE_CIO2_ENDPOINT			4
>> +#define SWNODE_NULL_TERMINATOR			5
>    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>> +struct sensor {
>> +	struct device *dev;
>> +	struct software_node swnodes[5];
>                              ^^^^^^^^^^
> This needs to be 6 instead of 5 to prevent memory corruption.
>
>> +	struct property_entry sensor_props[6];
>> +	struct property_entry cio2_props[3];
>> +	struct fwnode_handle *fwnode;
>> +};
>
>> +		nodes[SWNODE_NULL_TERMINATOR]   = SOFTWARE_NODE_NULL;
>                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Here.
>
> regards,
> dan carpenter
>