linux-kernel - [PATCH] ecryptfs (repost): release reference to lower mount if interpose fails

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Message-ID: <20100729110136.GC8337@lsanfilippo.unix.rd.tt.avira.com>
Date:	Thu, 29 Jul 2010 13:01:36 +0200
From:	Lino Sanfilippo <LinoSanfilippo@....de>
To:	tyhicks@...ux.vnet.ibm.com
Cc:	kirkland@...onical.com, ecryptfs-devel@...ts.launchpad.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ecryptfs (repost): release reference to lower mount if
	interpose fails


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>
---
This patch is against 2.6.35-rc5.

--- a/fs/ecryptfs/inode.c	2010-07-12 23:55:33.000000000 +0200
+++ b/fs/ecryptfs/inode.c	2010-07-19 19:21:16.000000000 +0200
@@ -264,7 +264,7 @@ 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);
@@ -339,8 +339,9 @@ 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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