configfs: fix registered group removal

This patch fixes a bug where configfs_register_group had added
a group in a tree, and userspace has done a rmdir on a dir somewhere
above that group and we hit a kernel crash. The problem is configfs_rmdir
will detach everything under it and unlink groups on the default_groups
list. It will not unlink groups added with configfs_register_group so when
configfs_unregister_group is called to drop its references to the group/items
we crash when we try to access the freed dentrys.

The patch just adds a check for if a rmdir has been done above
us and if so just does the unlink part of unregistration.

Sorry if you are getting this multiple times. I thouhgt I sent
this to some of you and lkml, but I do not see it.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 577cff2..39843fa 100644 (file)
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1777,6 +1777,16 @@ void configfs_unregister_group(struct config_group *group)
        struct dentry *dentry = group->cg_item.ci_dentry;
        struct dentry *parent = group->cg_item.ci_parent->ci_dentry;
 
+       mutex_lock(&subsys->su_mutex);
+       if (!group->cg_item.ci_parent->ci_group) {
+               /*
+                * The parent has already been unlinked and detached
+                * due to a rmdir.
+                */
+               goto unlink_group;
+       }
+       mutex_unlock(&subsys->su_mutex);
+
        inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
        spin_lock(&configfs_dirent_lock);
        configfs_detach_prep(dentry, NULL);
@@ -1791,6 +1801,7 @@ void configfs_unregister_group(struct config_group *group)
        dput(dentry);
 
        mutex_lock(&subsys->su_mutex);
+unlink_group:
        unlink_group(group);
        mutex_unlock(&subsys->su_mutex);
 }