linux-kernel - [PATCH v14 1/4] cgroup: fix uninitialised iterator in for_each_subsys

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Message-Id: <1433849530-22845-2-git-send-email-cyphar@cyphar.com>
Date:	Tue,  9 Jun 2015 21:32:07 +1000
From:	Aleksa Sarai <cyphar@...har.com>
To:	tj@...nel.org, lizefan@...wei.com, mingo@...hat.com,
	peterz@...radead.org
Cc:	richard@....at, fweisbec@...il.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Aleksa Sarai <cyphar@...har.com>
Subject: [PATCH v14 1/4] cgroup: fix uninitialised iterator in for_each_subsys_which

Fix the fact that @ssid is uninitialised in the case where
CGROUP_SUBSYS_COUNT = 0 by setting ssid to 0.

Fixes: cb4a31675270 ("cgroup: use bitmask to filter for_each_subsys")
Signed-off-by: Aleksa Sarai <cyphar@...har.com>
---
 kernel/cgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 6d6d3c7..12b580f 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -424,7 +424,7 @@ static int notify_on_release(const struct cgroup *cgrp)
  */
 #define for_each_subsys_which(ss, ssid, ss_maskp)			\
 	if (!CGROUP_SUBSYS_COUNT) /* to avoid spurious gcc warning */	\
-		;							\
+		(ssid) = 0;						\
 	else								\
 		for_each_set_bit(ssid, ss_maskp, CGROUP_SUBSYS_COUNT)	\
 			if (((ss) = cgroup_subsys[ssid]) && false)	\
-- 
2.4.2

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