[PATCH 3.8-stable] kernel/audit_tree.c: tree will leak memory whenfailure occurs in audit_trim_trees()

[Jonghwan Choi]

This patch looks like it should be in the 3.8-stable tree, should we apply
it?

------------------

From: "Chen Gang <gang.chen@xxxxxxxxxxx>"

commit 12b2f117f3bf738c1a00a6f64393f1953a740bd4 upstream

audit_trim_trees() calls get_tree().  If a failure occurs we must call
put_tree().

[akpm@xxxxxxxxxxxxxxxxxxxx: run put_tree() before mutex_lock() for small
scalability improvement]
Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Eric Paris <eparis@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
---
 kernel/audit_tree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 642a89c..a291aa2 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -617,9 +617,9 @@ void audit_trim_trees(void)
 		}
 		spin_unlock(&hash_lock);
 		trim_marked(tree);
-		put_tree(tree);
 		drop_collected_mounts(root_mnt);
 skip_it:
+		put_tree(tree);
 		mutex_lock(&audit_filter_mutex);
 	}
 	list_del(&cursor);
-- 
1.7.9.5

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