Re: [PATCH 1/3 v4] drivers/bus: Added Freescale Management Complex APIs

[Alexander Graf <agraf@suse.de>]

On 01.12.14 23:28, Stuart Yoder wrote:
> 
> 
>> -----Original Message-----
>> From: Alexander Graf [mailto:agraf@suse.de]
>> Sent: Thursday, November 27, 2014 8:30 AM
>> To: Rivera Jose-B46482; gregkh@linuxfoundation.org; arnd@arndb.de; linux-kernel@vger.kernel.org
>> Cc: Yoder Stuart-B08248; Phillips Kim-R1AAHA; Wood Scott-B07421; Hamciuc Bogdan-BHAMCIU1; Marginean
>> Alexandru-R89243; Thorpe Geoff-R01361; Sharma Bhupesh-B45370; Erez Nir-RM30794; Schmitt Richard-B43082
>> Subject: Re: [PATCH 1/3 v4] drivers/bus: Added Freescale Management Complex APIs
>>
>>
>>
>> On 13.11.14 18:54, J. German Rivera wrote:
>>> APIs to access the Management Complex (MC) hardware
>>> module of Freescale LS2 SoCs. This patch includes
>>> APIs to check the MC firmware version and to manipulate
>>> DPRC objects in the MC.
>>>
>>> Signed-off-by: J. German Rivera <German.Rivera@freescale.com>
>>> Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
>>
>> [...]
>>
>>> +/*
>>> + * Object descriptor, returned from dprc_get_obj()
>>> + */
>>> +struct dprc_obj_desc {
>>> +	/* Type of object: NULL terminated string */
>>> +	char type[16];
>>
>> I don't see where it actually gets NULL terminated - all 16 bytes come
>> directly from the device.
>>
>> While it's probably ok to trust it, I think we'd still be safer off if
>> we just make this a char[17] array to always have our NULL terminating
>> string. That way we're guaranteed we'll never run over our memory
>> boundaries.
> 
> The device is supposed to guarantee that the string is null 
> terminated...so there will never be valid chars in the 16th
> character.  So, what about just forcing type[15] = '\0'?
> 
> I think that would be better than making it a char[17].

Sure, that works too.


Alex