linux-kernel - Re: [PATCH, v3] arm: omap2: timer: fix a kmemleak caused in omap_get_timer

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Message-ID: <0c3e31b3-c26e-770f-6595-8682a3905309@ti.com>
Date:   Sat, 13 Jan 2018 03:57:28 +0530
From:   Keerthy <j-keerthy@...com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        Tony Lindgren <tony@...mide.com>
CC:     Qi Hou <qi.hou@...driver.com>, <linux@...linux.org.uk>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, v3] arm: omap2: timer: fix a kmemleak caused in
 omap_get_timer_dt



On 1/13/2018 2:47 AM, Grygorii Strashko wrote:
> 
> 
> On 01/12/2018 03:08 PM, Tony Lindgren wrote:
>> * Grygorii Strashko <grygorii.strashko@...com> [180112 20:36]:
>>> Hi
>>>
>>> On 01/10/2018 10:54 PM, Qi Hou wrote:
>>>> When more than one GP timers are used as kernel system timers and the
>>>> corresponding nodes in device-tree are marked with the same "disabled"
>>>> property, then the "attr" field of the property will be initialized
>>>> more than once as the property being added to sys file system via
>>>> __of_add_property_sysfs().
>>>>
>>>> In __of_add_property_sysfs(), the "name" field of pp->attr.attr is set
>>>> directly to the return value of safe_name(), without taking care of
>>>> whether it's already a valid pointer to a memory block. If it is, its
>>>> old value will always be overwritten by the new one and the memory 
>>>> block
>>>> allocated before will a "ghost", then a kmemleak happened.
>>>>
>>>> That the same "disabled" property being added to different nodes of 
>>>> device
>>>> tree would cause that kind of kmemleak overhead, at leat once.
>>>>
>>>> To fix it, allocate the property dynamically, and delete static one.
>>>
>>> Does it in sync with Keerthy's work [1]
>>
>> First fixes, then new stuff! Keerthy's work will have to
>> wait for v4.17, we want that series sitting in Linux next
>> for several weeks.
>>
> Np. just want to be sure every party is aware about each other's work

Thanks Grygorii. I am not touching the mach-omap2 timer.c file as part 
of my migration series.

I applied the above patch and it seems my series applies cleanly after 
this patch. Compiled fine.

>