memcg: free entries in soft_limit_tree if allocation fails

If we are not able to allocate tree nodes for all NUMA nodes then we
should release those that were allocated.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 1 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 4c53e971749e..2a1f7847b6ad 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4960,7 +4960,7 @@ static int mem_cgroup_soft_limit_tree_init(void)
                         tmp = -1;
                 rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
                 if (!rtpn)
-                        return 1;
+                        goto err_cleanup;
 
                 soft_limit_tree.rb_tree_per_node[node] = rtpn;
 
@@ -4971,6 +4971,16 @@ static int mem_cgroup_soft_limit_tree_init(void)
                 }
         }
         return 0;
+
+err_cleanup:
+        for_each_node_state(node, N_POSSIBLE) {
+                if (!soft_limit_tree.rb_tree_per_node[node])
+                        break;
+                kfree(soft_limit_tree.rb_tree_per_node[node]);
+                soft_limit_tree.rb_tree_per_node[node] = NULL;
+        }
+        return 1;
+
 }
 
 static struct cgroup_subsys_state * __ref