linux-kernel - Re: [PATCH UPDATED] xen/xenfs: fix xenbus message reads

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Date:	Wed, 17 Dec 2008 13:40:06 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	mingo@...e.hu, viro@....linux.org.uk, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, alex.zeffertt@...citrix.com,
	Ian.Campbell@...rix.com
Subject: Re: [PATCH UPDATED] xen/xenfs: fix xenbus message reads

Compute the remaining data size properly.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 drivers/xen/xenfs/xenbus.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

===================================================================
--- a/drivers/xen/xenfs/xenbus.c
+++ b/drivers/xen/xenfs/xenbus.c
@@ -132,7 +132,7 @@
 	rb = list_entry(u->read_buffers.next, struct read_buffer, list);
 	i = 0;
 	while (i < len) {
-		unsigned sz = min((unsigned)len - i, rb->cons - rb->len);
+		unsigned sz = min((unsigned)len - i, rb->len - rb->cons);
 
 		ret = copy_to_user(ubuf + i, &rb->msg[rb->cons], sz);
 


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