eCryptfs: fix error handling in ecryptfs_init

ecryptfs_init() exits without doing any cleanup jobs if
ecryptfs_init_messaging() fails.  In that case, eCryptfs leaves
sysfs entries, leaks memory, and causes an invalid page fault.
This patch fixes the problem.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 5 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index e557a6766927..a98497264fe8 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -813,6 +813,15 @@ out:
         return rc;
 }
 
+static void do_sysfs_unregistration(void)
+{
+        sysfs_remove_file(&ecryptfs_subsys.kobj,
+                          &sysfs_attr_version.attr);
+        sysfs_remove_file(&ecryptfs_subsys.kobj,
+                          &sysfs_attr_version_str.attr);
+        subsystem_unregister(&ecryptfs_subsys);
+}
+
 static int __init ecryptfs_init(void)
 {
         int rc;
@@ -851,6 +860,9 @@ static int __init ecryptfs_init(void)
         if (rc) {
                 ecryptfs_printk(KERN_ERR, "Failure occured while attempting to "
                                 "initialize the eCryptfs netlink socket\n");
+                do_sysfs_unregistration();
+                unregister_filesystem(&ecryptfs_fs_type);
+                ecryptfs_free_kmem_caches();
         }
 out:
         return rc;
@@ -858,11 +870,7 @@ out:
 
 static void __exit ecryptfs_exit(void)
 {
-        sysfs_remove_file(&ecryptfs_subsys.kobj,
-                          &sysfs_attr_version.attr);
-        sysfs_remove_file(&ecryptfs_subsys.kobj,
-                          &sysfs_attr_version_str.attr);
-        subsystem_unregister(&ecryptfs_subsys);
+        do_sysfs_unregistration();
         ecryptfs_release_messaging(ecryptfs_transport);
         unregister_filesystem(&ecryptfs_fs_type);
         ecryptfs_free_kmem_caches();