kernel/audit_tree.c: tree will leak memory when failure occurs in audit_trim_trees()

commit 12b2f117f3bf738c1a00a6f64393f1953a740bd4 upstream.

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

[akpm@linux-foundation.org: run put_tree() before mutex_lock() for small scalability improvement]
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 642a89c4f3d60c23cabf89b86d387f2a29b2bea9..a291aa23fb3fa770756b05f7453be4c92531004c 100644 (file)
--- 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);