[patch] copy_namespace check for NULL

[Marcus Alanen]

Hello Andrew,

As far as I can see the copy_tree() function can return NULL, so this 
checks for it. Same thing in 2.4, I'll rediff for Marcelo.

Marcus

#
# create_patch: fix_copy_namespace-2004-01-26-A.patch
# Date: Mon Jan 26 21:22:51 EET 2004
#
diff -Naurd --exclude-from=/home/msa/linux/base/diff_exclude linus-2.6.2-rc1-mm2/fs/namespace.c fix_copy_namespace-2.6.2-rc1-mm2/fs/namespace.c
--- linus-2.6.2-rc1-mm2/fs/namespace.c	2004-01-26 19:15:05.000000000 +0000
+++ fix_copy_namespace-2.6.2-rc1-mm2/fs/namespace.c	2004-01-26 19:17:06.000000000 +0000
@@ -822,12 +822,16 @@
 
 	atomic_set(&new_ns->count, 1);
 	init_rwsem(&new_ns->sem);
-	new_ns->root = NULL;
 	INIT_LIST_HEAD(&new_ns->list);
 
 	down_write(&tsk->namespace->sem);
 	/* First pass: copy the tree topology */
 	new_ns->root = copy_tree(namespace->root, namespace->root->mnt_root);
+	if (!new_ns->root) {
+		up_write(&tsk->namespace->sem);
+		kfree(new_ns);
+		goto out;
+	}
 	spin_lock(&vfsmount_lock);
 	list_add_tail(&new_ns->list, &new_ns->root->mnt_list);
 	spin_unlock(&vfsmount_lock);

-
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