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

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Date:	Tue, 2 Mar 2010 12:42:06 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	André Goddard Rosa <andre.goddard@...il.com>
Cc:	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.
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