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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 12 Jan 2018 14:36:04 -0600
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Qi Hou <qi.hou@...driver.com>, <tony@...mide.com>,
        <linux@...linux.org.uk>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Keerthy <j-keerthy@...com>
Subject: Re: [PATCH, v3] arm: omap2: timer: fix a kmemleak caused in
 omap_get_timer_dt

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]

[1] https://www.spinics.net/lists/linux-omap/msg141100.html
> 
> Signed-off-by: Qi Hou <qi.hou@...driver.com>
> ---
>   arch/arm/mach-omap2/timer.c | 19 +++++++++++--------
>   1 file changed, 11 insertions(+), 8 deletions(-)

-- 
regards,
-grygorii