linux-kernel - Re: [PATCH] seqfile: fix uninitialized memory allocation in mounts

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Message-ID: <20070815090855.GB19293@mail.ustc.edu.cn>
Date:	Wed, 15 Aug 2007 17:08:55 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [PATCH] seqfile: fix uninitialized memory allocation in
	mounts_open()

On Wed, Aug 15, 2007 at 01:04:05PM +0400, Alexey Dobriyan wrote:
> On 8/15/07, Fengguang Wu <wfg@...l.ustc.edu.cn> wrote:
> > proc_mounts.m.buf is not explicitly zeroed at allocation time, which
> > may later confuse the seqfile code and triggle an kfree(m->buf).
> 
> It's cleared in seq_open().

So it is :)

> > --- linux.orig/fs/proc/base.c
> > +++ linux/fs/proc/base.c
> > @@ -380,7 +380,7 @@ static int mounts_open(struct inode *ino
> >
> >  	if (ns) {
> >  		ret = -ENOMEM;
> > -		p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
> > +		p = kzalloc(sizeof(struct proc_mounts), GFP_KERNEL);
> >  		if (p) {
> >  			file->private_data = &p->m;
> >  			ret = seq_open(file, &mounts_op);

-
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