linux-kernel - [017/111] ecryptfs: release reference to lower mount if interpose fails

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Date:	Wed, 11 Aug 2010 16:53:58 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Lino Sanfilippo <LinoSanfilippo@....de>,
	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
Subject: [017/111] ecryptfs: release reference to lower mount if interpose fails

2.6.32-stable review patch.  If anyone has any objections, please let us know.

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

From: Lino Sanfilippo <LinoSanfilippo@....de>

commit 31f73bee3e170b7cabb35db9e2f4bf7919b9d036 upstream.

In ecryptfs_lookup_and_interpose_lower() the lower mount is not decremented
if allocation of a dentry info struct failed. As a result the lower filesystem
cant be unmounted any more (since it is considered busy). This patch corrects
the reference counting.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
Signed-off-by: Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/ecryptfs/inode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -272,7 +272,7 @@ int ecryptfs_lookup_and_interpose_lower(
 		printk(KERN_ERR "%s: Out of memory whilst attempting "
 		       "to allocate ecryptfs_dentry_info struct\n",
 			__func__);
-		goto out_dput;
+		goto out_put;
 	}
 	ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry);
 	ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt);
@@ -345,8 +345,9 @@ int ecryptfs_lookup_and_interpose_lower(
 out_free_kmem:
 	kmem_cache_free(ecryptfs_header_cache_2, page_virt);
 	goto out;
-out_dput:
+out_put:
 	dput(lower_dentry);
+	mntput(lower_mnt);
 	d_drop(ecryptfs_dentry);
 out:
 	return rc;


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