From: Sven Eckelmann <sven@narfation.org>
Date: Wed, 22 Feb 2017 16:16:41 +0000 (+0100)
Subject: batman-adv: Fix possible side-effects in _batadv_dbg
X-Git-Tag: v4.12-rc1~108^2~214^2~15
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=a09c94d07becd85b5be57074fd4553e197ce97a4;p=linux.git

batman-adv: Fix possible side-effects in _batadv_dbg

An argument of a macro should not be evaluated multiple times. Otherwise
embedded operations in these arguments will be executed multiple times.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---

diff --git a/net/batman-adv/log.h b/net/batman-adv/log.h
index 7a2b9f4da078..65ce97efa6b5 100644
--- a/net/batman-adv/log.h
+++ b/net/batman-adv/log.h
@@ -73,9 +73,10 @@ __printf(2, 3);
 /* possibly ratelimited debug output */
 #define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...)		\
 	do {								\
-		if (atomic_read(&(bat_priv)->log_level) & (type) &&	\
+		struct batadv_priv *__batpriv = (bat_priv);		\
+		if (atomic_read(&__batpriv->log_level) & (type) &&	\
 		    (!(ratelimited) || net_ratelimit()))		\
-			batadv_debug_log(bat_priv, fmt, ## arg);	\
+			batadv_debug_log(__batpriv, fmt, ## arg);	\
 	}								\
 	while (0)
 #else /* !CONFIG_BATMAN_ADV_DEBUG */