--- linux-2.4/fs/proc/base.c	2004-04-15 07:09:32.000000000 +0100
+++ linux-2.4/fs/proc/base.c.plasmaroo	2004-08-09 23:30:43.869195800 +0100
@@ -187,7 +187,7 @@ static int proc_pid_cmdline(struct task_
 	if (mm)
 		atomic_inc(&mm->mm_users);
 	task_unlock(task);
-	if (mm) {
+	if (mm && mm->arg_end) {
 		int len = mm->arg_end - mm->arg_start;
 		if (len > PAGE_SIZE)
 			len = PAGE_SIZE;