linux-kernel - Re: [PATCH] exofs： don't increase urilen if krealloc() fails

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Date:	Mon, 29 Apr 2013 09:40:26 -0700
From:	Boaz Harrosh <bharrosh@...asas.com>
To:	Zhao Hongjiang <zhaohongjiang@...wei.com>
CC:	<bhalevy@...ian.com>, Andrew Morton <akpm@...ux-foundation.org>,
	<osd-dev@...n-osd.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] exofs： don't increase urilen if krealloc() fails

On 04/28/2013 04:46 AM, Zhao Hongjiang wrote:
> Without the patch, edp->urilen is increased before krealloc(). If krealloc() fails,
> edp->urilen is too high. Fix that by only updating edp->urilen if krealloc() is successful.
> 
> Signed-off-by: Zhao Hongjiang <zhaohongjiang@...wei.com>
> ---
>  fs/exofs/sys.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/exofs/sys.c b/fs/exofs/sys.c
> index 1b4f2f9..79b0a85 100644
> --- a/fs/exofs/sys.c
> +++ b/fs/exofs/sys.c
> @@ -82,11 +82,11 @@ static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
>  {
>  	uint8_t *new_uri;
>  
> -	edp->urilen = strlen(buf) + 1;
> -	new_uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
> +	new_uri = krealloc(edp->uri, strlen(buf) + 1, GFP_KERNEL);
>  	if (new_uri == NULL)
>  		return -ENOMEM;
>  	edp->uri = new_uri;
> +	edp->urilen = strlen(buf) + 1;
>  	strncpy(edp->uri, buf, edp->urilen);
>  	return edp->urilen;
>  }
> -- 1.7.1
> 

Thank you, will apply

Boaz
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