linux-kernel - [115/118] kernel/audit_tree.c: tree will leak memory when failure occurs in audit_trim

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Message-ID: <lsq.1368193181.549905950@decadent.org.uk>
Date:	Fri, 10 May 2013 14:39:41 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Eric Paris" <eparis@...hat.com>,
	"Al Viro" <viro@...iv.linux.org.uk>,
	"Chen Gang" <gang.chen@...anux.com>
Subject: [115/118] kernel/audit_tree.c: tree will leak memory when failure
 occurs in audit_trim_trees()

3.2.45-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Chen Gang <gang.chen@...anux.com>

commit 12b2f117f3bf738c1a00a6f64393f1953a740bd4 upstream.

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

[akpm@...ux-foundation.org: run put_tree() before mutex_lock() for small scalability improvement]
Signed-off-by: Chen Gang <gang.chen@...anux.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Eric Paris <eparis@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/audit_tree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -608,9 +608,9 @@ 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);

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