linux-kernel - Re: [PATCH] binfmt_elf: plug a memory leak situation on dump

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Date:	Wed,  3 Mar 2010 11:02:08 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andre Goddard Rosa <andre.goddard@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Roland McGrath <roland@...hat.com>,
	WANG Cong <amwang@...hat.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] binfmt_elf: plug a memory leak situation on dump_seek()

> On Fri, 26 Feb 2010 00:54:40 -0300
> Andr__ Goddard Rosa <andre.goddard@...il.com> wrote:
> 
> > Signed-off-by: Andr__ Goddard Rosa <andre.goddard@...il.com>
> > ---
> >  fs/binfmt_elf.c |   10 +++++++---
> >  1 files changed, 7 insertions(+), 3 deletions(-)
> > 
> > diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
> > index fd5b2ea..13b0845 100644
> > --- a/fs/binfmt_elf.c
> > +++ b/fs/binfmt_elf.c
> > @@ -1096,6 +1096,8 @@ static int dump_write(struct file *file, const void *addr, int nr)
> >  
> >  static int dump_seek(struct file *file, loff_t off)
> >  {
> > +	int ret = 1;
> > +
> >  	if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
> >  		if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
> >  			return 0;
> > @@ -1107,13 +1109,15 @@ static int dump_seek(struct file *file, loff_t off)
> >  			unsigned long n = off;
> >  			if (n > PAGE_SIZE)
> >  				n = PAGE_SIZE;
> > -			if (!dump_write(file, buf, n))
> > -				return 0;
> > +			if (!dump_write(file, buf, n)) {
> > +				ret = 0;
> > +				break;
> > +			}
> >  			off -= n;
> >  		}
> >  		free_page((unsigned long)buf);
> >  	}
> > -	return 1;
> > +	return ret;
> >  }
> 
> Please don't send unchangelogged patches.
> 
> Explain the leak.
> 
> Explain the user impact (ie: how it is triggered).
> 
> Explain how the patch fixes it.
> 
> Thanks.

Hi Andre, 

plus, can you please rebase this patch onto -mmotm tree? it have lots elf core dump related
fix and it is going to be merged at this merge window, maybe.

I think your patch is correct. but I hope to avoid patch confliction.

Thanks.


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