linux-kernel - Re: [PATCH] kobject: Fix kobject_set_name

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Message-ID: <20100312041518.GA31394@kroah.com>
Date:	Thu, 11 Mar 2010 20:15:18 -0800
From:	Greg KH <greg@...ah.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kobject: Fix kobject_set_name_vargs()

On Thu, Mar 11, 2010 at 09:50:52PM +0100, Eric Dumazet wrote:
> In case of kvasprintf() failure, we can leak old kobject name.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
> diff --git a/lib/kobject.c b/lib/kobject.c
> index 8115eb1..1247c57 100644
> --- a/lib/kobject.c
> +++ b/lib/kobject.c
> @@ -222,8 +222,10 @@ int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
>  		return 0;
>  
>  	kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
> -	if (!kobj->name)
> +	if (!kobj->name) {
> +		kobj->name = old_name;
>  		return -ENOMEM;
> +	}

Are you sure?  I think we've been over this very thing many times in the
past...

Kay, I can't recall the issue here, can you?

thanks,

greg k-h
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