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@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1375790802-11857-1-git-send-email-xtfeng@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b7415cfdd7de..cf8f100433e0 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;