linux-kernel - Re: [PATCH] mtd: nand: fix memory leak in ONFI extended parameter page

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Message-ID: <5237BAA9.6000606@freescale.com>
Date:	Tue, 17 Sep 2013 10:12:57 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	David Woodhouse <dwmw2@...radead.org>,
	Artem Bityutskiy <dedekind1@...il.com>,
	<linux-mtd@...ts.infradead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: nand: fix memory leak in ONFI extended parameter
 page

于 2013年09月17日 09:31, Brian Norris 写道:
> This fixes a memory leak in the ONFI support code for detecting the
> required ECC levels from this commit:
>
>   commit 6dcbe0cdd83fb5f77be4f44c9e06c535281c375a
>   Author: Huang Shijie <b32955@...escale.com>
>   Date:   Wed May 22 10:28:27 2013 +0800
>
>       mtd: get the ECC info from the Extended Parameter Page
>
> In the success case, we never freed the 'ep' buffer.
>
> Also, this fixes an oversight in the same commit where we (harmlessly)
> freed the NULL pointer.
>
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> Cc: Huang Shijie <b32955@...escale.com>
> ---
> David, if there are no objections, can you send this to Linus for 3.12?
>
> If this doesn't make it into 3.12, then it will be -stable material.
>
>  drivers/mtd/nand/nand_base.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index d4578a1..00022b4 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -2869,10 +2869,8 @@ static int nand_flash_detect_ext_param_page(struct mtd_info *mtd,
>  
>  	len = le16_to_cpu(p->ext_param_page_length) * 16;
>  	ep = kmalloc(len, GFP_KERNEL);
> -	if (!ep) {
> -		ret = -ENOMEM;
> -		goto ext_out;
> -	}
> +	if (!ep)
> +		return -ENOMEM;
>  
>  	/* Send our own NAND_CMD_PARAM. */
>  	chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
> @@ -2920,7 +2918,7 @@ static int nand_flash_detect_ext_param_page(struct mtd_info *mtd,
>  	}
>  
>  	pr_info("ONFI extended param page detected.\n");
> -	return 0;
> +	ret = 0;
>  
>  ext_out:
>  	kfree(ep);
good catch!

Acked-by: Huang Shijie <b32955@...escale.com>

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