linux-kernel - [PATCH] unionfs: fix memory leak

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Date:	Sun, 29 Jun 2008 01:07:15 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Erez Zadok <ezk@...sunysb.edu>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] unionfs: fix memory leak

Unionfs has slowly been leaking memory: although many places do explicitly
free the dentry's lower_paths array (and I've not changed those, in case
the ordering is important), not all do - and adding a WARN_ON didn't seem
to finger any particular culprit.  So free_dentry_private_data needs to
kfree lower_paths (other freeers are good about setting it to NULL).

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---
Should follow mmotm's git-unionfs-fixup.patch

 fs/unionfs/lookup.c |    1 +
 1 file changed, 1 insertion(+)
 
--- mmotm/fs/unionfs/lookup.c	2008-06-27 13:39:18.000000000 +0100
+++ linux/fs/unionfs/lookup.c	2008-06-27 14:08:00.000000000 +0100
@@ -498,6 +498,7 @@ void free_dentry_private_data(struct den
 {
 	if (!dentry || !dentry->d_fsdata)
 		return;
+	kfree(UNIONFS_D(dentry)->lower_paths);
 	kmem_cache_free(unionfs_dentry_cachep, dentry->d_fsdata);
 	dentry->d_fsdata = NULL;
 }
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