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authorSha Zhengju <handai.szj@taobao.com>2012-05-10 13:01:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-10 15:06:44 -0700
commit8c7577637ca31385e92769a77e2ab5b428e8b99c (patch)
treeecf350b4defdd9ad31a9d1eb6353b890c5951eb9 /mm/memcontrol.c
parent5e2bf0142231194d36fdc9596b36a261ed2b9fe7 (diff)
memcg: free spare array to avoid memory leak
When the last event is unregistered, there is no need to keep the spare array anymore. So free it to avoid memory leak. Signed-off-by: Sha Zhengju <handai.szj@taobao.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 31ab9c3f017..b659260c56a 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4507,6 +4507,12 @@ static void mem_cgroup_usage_unregister_event(struct cgroup *cgrp,
swap_buffers:
/* Swap primary and spare array */
thresholds->spare = thresholds->primary;
+ /* If all events are unregistered, free the spare array */
+ if (!new) {
+ kfree(thresholds->spare);
+ thresholds->spare = NULL;
+ }
+
rcu_assign_pointer(thresholds->primary, new);
/* To be sure that nobody uses thresholds */