--- linux-2.6.7/fs/proc/base.c~	2004-08-05 10:35:04.411443536 +0200
+++ linux-2.6.7/fs/proc/base.c	2004-08-05 10:35:04.412443384 +0200
@@ -330,6 +330,9 @@
 	if (!mm)
 		goto out;
 
+	if (!mm->arg_end)
+		goto out;
+	
  	len = mm->arg_end - mm->arg_start;
  
 	if (len > PAGE_SIZE)