linux-kernel - [PATCH] devpts: plug the memory leak in kill

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Message-Id: <1380636327-4452-1-git-send-email-ihadzic@research.bell-labs.com>
Date:	Tue,  1 Oct 2013 10:05:27 -0400
From:	Ilija Hadzic <ihadzic@...earch.bell-labs.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	Ilija Hadzic <ihadzic@...earch.bell-labs.com>,
	stable@...r.kernel.org
Subject: [PATCH] devpts: plug the memory leak in kill_sb

When devpts is unmounted, there may be a no-longer-used
IDR tree hanging off the superblock we are about to kill.
This needs to be cleaned up before destroying the SB.

The leak is usually not a big deal because unmounting
devpts is typically done when shutting down the whole
machine. However, shutting down an LXC container instead
of a physical machine exposes the problem (the garbage is
detectable with kmemleak).

Signed-off-by: Ilija Hadzic <ihadzic@...earch.bell-labs.com>
Cc: stable@...r.kernel.org
---
 fs/devpts/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 073d30b..a726b9f 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -498,6 +498,7 @@ static void devpts_kill_sb(struct super_block *sb)
 {
 	struct pts_fs_info *fsi = DEVPTS_SB(sb);
 
+	ida_destroy(&fsi->allocated_ptys);
 	kfree(fsi);
 	kill_litter_super(sb);
 }
-- 
1.8.2.1

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