linux-kernel - [PATCH] cpumask: fix cpumask leak in partition_sched

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Message-Id: <1374910011-72985-1-git-send-email-xtfeng@gmail.com>
Date:	Sat, 27 Jul 2013 15:26:51 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Xiaotian Feng <xtfeng@...il.com>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] cpumask: fix cpumask leak in partition_sched_domains

If doms_new is NULL, partition_sched_domains() will reset ndoms_cur
to 0, and free old sched domains with free_sched_domains(doms_cur, ndoms_cur).
As ndoms_cur is 0, the cpumask will not be freed.

Signed-off-by: Xiaotian Feng <xtfeng@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org
---
 kernel/sched/core.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b7c32cb..3d6c57b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6184,8 +6184,9 @@ match1:
 		;
 	}
 
+	n= ndoms_cur;
 	if (doms_new == NULL) {
-		ndoms_cur = 0;
+		n = 0;
 		doms_new = &fallback_doms;
 		cpumask_andnot(doms_new[0], cpu_active_mask, cpu_isolated_map);
 		WARN_ON_ONCE(dattr_new);
@@ -6193,7 +6194,7 @@ match1:
 
 	/* Build new domains */
 	for (i = 0; i < ndoms_new; i++) {
-		for (j = 0; j < ndoms_cur && !new_topology; j++) {
+		for (j = 0; j < n && !new_topology; j++) {
 			if (cpumask_equal(doms_new[i], doms_cur[j])
 			    && dattrs_equal(dattr_new, i, dattr_cur, j))
 				goto match2;
-- 
1.7.9.6 (Apple Git-31.1)

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