linux-kernel - Re: [PATCH v2 03/10] Documentation/kdbus: fix operator precedence issue in KDBUS_ITEM

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Date:	Wed, 10 Jun 2015 16:03:16 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Sergei Zviagintsev <sergei@...v.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/10] Documentation/kdbus: fix operator precedence
 issue in KDBUS_ITEM_NEXT macro

Hi

On Tue, Jun 9, 2015 at 11:00 PM, Sergei Zviagintsev <sergei@...v.net> wrote:
> `item' argument in KDBUS_ITEM_NEXT macro example is not enclosed into
> parentheses when the cast operator is applied, which leads to improper
> type conversion if `item' is supplied as a complex expression, e.g.
>
>     KDBUS_ITEM_NEXT(condition ? a : b)
>
> Use parentheses properly to guarantee right precedence.
>
> Signed-off-by: Sergei Zviagintsev <sergei@...v.net>
> ---
>  Documentation/kdbus/kdbus.item.xml | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: David Herrmann <dh.herrmann@...il.com>

Thanks
David

> diff --git a/Documentation/kdbus/kdbus.item.xml b/Documentation/kdbus/kdbus.item.xml
> index 09f8b903116f..b0eeeef995af 100644
> --- a/Documentation/kdbus/kdbus.item.xml
> +++ b/Documentation/kdbus/kdbus.item.xml
> @@ -69,7 +69,7 @@
>  #define KDBUS_ALIGN8(val) (((val) + 7) & ~7)
>
>  #define KDBUS_ITEM_NEXT(item) \
> -    (typeof(item))(((uint8_t *)item) + KDBUS_ALIGN8((item)->size))
> +    (typeof(item))((uint8_t *)(item) + KDBUS_ALIGN8((item)->size))
>
>  #define KDBUS_ITEM_FOREACH(item, head, first)                      \
>      for (item = (head)->first;                                     \
> --
> 1.8.3.1
>
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