linux-kernel - Re: [patch] sysfs: checking for NULL instead of ERR

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Date:	Wed, 25 Aug 2010 01:42:31 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Dan Carpenter <error27@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Serge Hallyn <serue@...ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] sysfs: checking for NULL instead of ERR_PTR

Dan Carpenter <error27@...il.com> writes:

> d_path() returns an ERR_PTR and it doesn't return NULL.
>
> CC:stable@...nel.org
> Signed-off-by: Dan Carpenter <error27@...il.com>

This is definitely a needed bug fix.

Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>

If we ever get ERR_PTR(-ENAMETOOLONG) and this case actually matters 
something is very wrong with sysfs, but that is another story.

Eric


> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> index 1b27b56..da3fefe 100644
> --- a/fs/sysfs/file.c
> +++ b/fs/sysfs/file.c
> @@ -340,7 +340,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
>  	char *p;
>  
>  	p = d_path(&file->f_path, last_sysfs_file, sizeof(last_sysfs_file));
> -	if (p)
> +	if (!IS_ERR(p))
>  		memmove(last_sysfs_file, p, strlen(p) + 1);
>  
>  	/* need attr_sd for attr and ops, its parent for kobj */
--
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