linux-kernel - Re: Fix memory leak in binder--version2

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Message-ID: <CAMP5Xgfo3u5QoKmkOpCyxHaEkCScWwKFDLnfQMH3mevcrF7aJQ@mail.gmail.com>
Date:	Mon, 15 Oct 2012 16:55:21 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	"Tu, Xiaobing" <xiaobing.tu@...el.com>,
	"ccross@...roid.com" <ccross@...roid.com>,
	"davej@...hat.com" <davej@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"Zhang, Di" <di.zhang@...el.com>,
	"Ma, Xindong" <xindong.ma@...el.com>,
	"Zuo, Alex" <alex.zuo@...el.com>
Subject: Re: Fix memory leak in binder--version2

On Mon, Oct 15, 2012 at 3:52 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Mon, Oct 15, 2012 at 07:20:01AM +0000, Tu, Xiaobing wrote:
>> After enabling kmemleak and run monkey, following memleak is reported:
>> unreferenced object 0xeed27f80 (size 64):
>>   comm "Binder_8", pid 641, jiffies 4294946341 (age 2275.810s)
>>   hex dump (first 32 bytes):
>>     4f dd 00 00 84 7f d2 ee 84 7f d2 ee 01 00 00 00  O...............
>>     00 00 00 00 00 00 00 00 00 aa 4c d7 00 00 00 00  ..........L.....
>>   backtrace:
>>     [<c184fabc>] kmemleak_alloc+0x3c/0xa0
>>     [<c12f391e>] kmem_cache_alloc_trace+0x9e/0x180
>>     [<c1668bb5>] binder_thread_write+0xcf5/0x23a0
>>     [<c166b091>] binder_ioctl+0x1f1/0x530
>>     [<c130dcf6>] do_vfs_ioctl+0x86/0x5e0
>>     [<c130e282>] sys_ioctl+0x32/0x60
>>     [<c1872e01>] syscall_call+0x7/0xb
>>     [<ffffffff>] 0xffffffff
>>
>> The work item in async_todo list is not freed when binder released.
>> Also the async transaction should also be freed in binder_release_work.
>>
>> Signed-off-by: Leon Ma <xindong.ma@...el.com>
>> Signed-off-by: Di Zhang <di.zhang@...el.com>
>> ---
>>  drivers/staging/android/binder.c |    6 ++++++
>>  1 files changed, 6 insertions(+), 0 deletions(-)
>
> Nice fix, but next time can you at least use scripts/get_maintainer.pl
> to figure out who to send this to?  I'll queue it up soon, but it took
> akpm to point me at this for me to notice it.

This patch was just pointer out to me as well. I have a similar fix
queued up at https://android-review.googlesource.com/#/c/43801/ that
is still being tested. It fixes this leak and a theoretical leak of
death notification objects.

-- 
Arve Hjønnevåg
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