diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 67e556c..3082a7e 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -93,6 +93,13 @@
 		__putname(name);
 		return NULL;
 	}
+
+	/*
+	 * This function relies on the fact that dentry_path_raw() will place
+	 * the path name at the end of the provided buffer.
+	 */
+	BUG_ON(p + strlen(p) + 1 != name + PATH_MAX);
+
 	strlcpy(name, root, PATH_MAX);
 	if (len > p - name) {
 		__putname(name);