--- src/sys/kern/vfs_syscalls.c	2005/10/09 18:07:55	1.74
+++ src/sys/kern/vfs_syscalls.c	2005/12/02 17:29:45	1.75
@@ -3029,7 +3029,8 @@ revoke(struct revoke_args *uap)
 		}
 		vrele(vp);
 	}
-	crfree(cred);
+	if (cred)
+		crfree(cred);
 	return (error);
 }