linux-kernel - Re: [PATCH v3 05/10] device property: Add a function to obtain a node's prefix

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Message-ID: <20190830124657.GE2680@smile.fi.intel.com>
Date:   Fri, 30 Aug 2019 15:46:57 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        rafael@...nel.org, linux-acpi@...r.kernel.org,
        devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 05/10] device property: Add a function to obtain a
 node's prefix

On Thu, Aug 29, 2019 at 01:10:38PM +0300, Sakari Ailus wrote:
> The prefix is used for printing purpose before a node, and it also works
> as a separator between two nodes.

> +	/* Is this the root node? */
> +	parent = fwnode_get_parent(fwnode);
> +	if (!parent)
> +		return "";
> +
> +	/* Is this 2nd node from the root? */
> +	parent = fwnode_get_next_parent(parent);
> +	if (!parent)

Can we theoretically have a case when we got parent != NULL and thus taken
reference, while the 2nd one is NULL and we leak reference here (and in all
similar places)?

> +		return "";
> +
> +	fwnode_handle_put(parent);

-- 
With Best Regards,
Andy Shevchenko