linux-kernel - Re: [PATCH] debugfs: allow bad parent pointers to be passed in

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Date:	Mon, 30 Mar 2015 18:37:12 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alex Elder <elder@...aro.org>
Subject: Re: [PATCH] debugfs: allow bad parent pointers to be passed in

On 30 March 2015 at 18:29, Greg KH <gregkh@...uxfoundation.org> wrote:
> If something went wrong with creating a debugfs file/symlink/directory,
> that value could be passed down into debugfs again as a parent dentry.
> To make caller code simpler, just error out if this happens, and don't
> crash the kernel.
>
> Reported-by: Alex Elder <elder@...aro.org>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
> ---
>  fs/debugfs/inode.c |    3 +++
>  1 file changed, 3 insertions(+)
>
> --- a/fs/debugfs/inode.c
> +++ b/fs/debugfs/inode.c
> @@ -254,6 +254,9 @@ static struct dentry *start_creating(con
>
>         pr_debug("debugfs: creating file '%s'\n",name);
>
> +       if (IS_ERR(parent))
> +               return parent;
> +
>         error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
>                               &debugfs_mount_count);
>         if (error)

Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>
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