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

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Message-ID: <20070815090116.GA19893@mail.ustc.edu.cn>
Date:	Wed, 15 Aug 2007 17:01:16 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	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 04:56:37PM +0800, Fengguang Wu 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 weird it did not show up in real world.  Could I be wrong?

> --- 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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