linux-kernel - Re: [PATCH 6/6] mqueue: fix mq_open() file descriptor leak on user-space processes

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Date:	Thu, 25 Feb 2010 12:00:56 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	André Goddard Rosa <andre.goddard@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Serge E . Hallyn" <serue@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] mqueue: fix mq_open() file descriptor leak on 
	user-space processes

2010/2/25 Américo Wang <xiyou.wangcong@...il.com>:
> On Tue, Feb 23, 2010 at 3:04 PM, André Goddard Rosa
> <andre.goddard@...il.com> wrote:
>> It can be triggered by the following test program:
>>
>
> <snip>
>
>>
>> When not running valgrind, user-space program segfaults trying to execute
>> strerror(errno). With valgrind, it executes successfully and prints the
>> 5 open files: stdin, stdout, stderr, pipe[0] and pipe[1].
>>
>> Signed-off-by: André Goddard Rosa <andre.goddard@...il.com>
>> ---
>
> The code has more than just this problem, could you please try
> my patch below?
>
> Thanks.
>
> ---------------------------->
>
> Clean up the failure path of sys_mq_open().
>
> Reorder the goto labels;
> Rename 'upsem' to 'upunlock';
> Remove some unused labels;
> Fix some wrong goto path.
>

I think it's wrong to move dput after mntput

> Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>
>
> ---
>
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