linux-kernel - Re: [Patch] mqueue: fix the bad code in sys_mq

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Message-ID: <20100225161554.GD3842@hack>
Date:	Fri, 26 Feb 2010 00:15:54 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	André Goddard Rosa <andre.goddard@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	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>,
	Xiaotian Feng <xtfeng@...il.com>
Subject: Re: [Patch] mqueue: fix the bad code in sys_mq_open()

On Thu, Feb 25, 2010 at 12:41:47PM -0300, André Goddard Rosa wrote:
>Hi, Américo!
>
...
>I have some questions below:
>
>Inside do_open() and do_create() on mqueue.c, we call
>dentry_open()/__dentry_open().
>
>If dentry_open() fails, it'll automatically call:
>        dput(dentry);
>        mntput(mnt);
>

Oh, I trusted the current code too much, clearly this needs to be fixed
too. I already checked the 14 callers of dentry_open(), and will send
out a patchset to fix this tomorrow. (And the mqueue part will be based
on your patch.)

Thanks!

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