linux-kernel - [PATCH v2 09/10] samples/kdbus: fix operator precedence issue in KDBUS_ITEM

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Message-Id: <6e1f3831f94990562b6e4a324e560b436b27ec58.1433882692.git.sergei@s15v.net>
Date:	Wed, 10 Jun 2015 00:00:07 +0300
From:	Sergei Zviagintsev <sergei@...v.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	David Herrmann <dh.herrmann@...glemail.com>,
	Djalal Harouni <tixxdz@...ndz.org>
Cc:	linux-kernel@...r.kernel.org, Sergei Zviagintsev <sergei@...v.net>
Subject: [PATCH v2 09/10] samples/kdbus: fix operator precedence issue in KDBUS_ITEM_NEXT macro

`item' argument in KDBUS_ITEM_NEXT macro 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>
---
 samples/kdbus/kdbus-api.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/kdbus/kdbus-api.h b/samples/kdbus/kdbus-api.h
index 2de4d6a8c51e..fab873b89d97 100644
--- a/samples/kdbus/kdbus-api.h
+++ b/samples/kdbus/kdbus-api.h
@@ -8,7 +8,7 @@
 #define KDBUS_ITEM_HEADER_SIZE offsetof(struct kdbus_item, data)
 #define KDBUS_ITEM_SIZE(s) KDBUS_ALIGN8((s) + KDBUS_ITEM_HEADER_SIZE)
 #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_FOREACH(iter, first, _size)				\
 	for (iter = (first);						\
 	     ((uint8_t *)(iter) < (uint8_t *)(first) + (_size)) &&	\
-- 
1.8.3.1

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