[PATCH] hang on /dev/kmem

[Hugh Dickins]

read_kmem() gets stuck in silly loop after reading last vmalloc area.
Patch below against 2.4.8-pre1 or 2.4.7-ac1: please apply.

Hugh

--- linux-2.4.8-pre1/drivers/char/mem.c	Wed Jul 11 00:07:46 2001
+++ linux/drivers/char/mem.c	Fri Jul 27 21:40:05 2001
@@ -260,7 +260,9 @@
 			if (len > PAGE_SIZE)
 				len = PAGE_SIZE;
 			len = vread(kbuf, (char *)p, len);
-			if (len && copy_to_user(buf, kbuf, len)) {
+			if (!len)
+				break;
+			if (copy_to_user(buf, kbuf, len)) {
 				free_page((unsigned long)kbuf);
 				return -EFAULT;
 			}