linux-kernel - Re: [RELEASE] Lguest for 2.6.21

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Date:	Thu, 3 May 2007 03:59:31 +0800
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>
Subject: Re: [RELEASE] Lguest for 2.6.21

On Thu, May 03, 2007 at 03:33:03AM +0800, WANG Cong wrote:
>Hi Rusty!
>
>I found you forgot to check the return value of copy_from_user, and here is the fix for drivers/lguest/interrupts_and_traps.c.
>

Also this one, in drivers/lguest/hypercalls.c.

Signed-off-by: WANG Cong <xiyou.wangcong@...il.com>

---

--- linux-2.6.21-rc7-mm2/drivers/lguest/hypercalls.c.orig	2007-05-03 03:45:53.000000000 +0800
+++ linux-2.6.21-rc7-mm2/drivers/lguest/hypercalls.c	2007-05-03 03:46:20.000000000 +0800
@@ -102,7 +102,8 @@ static void do_async_hcalls(struct lgues
 	unsigned int i;
 	u8 st[LHCALL_RING_SIZE];
 
-	copy_from_user(&st, &lg->lguest_data->hcall_status, sizeof(st));
+	if (copy_from_user(&st, &lg->lguest_data->hcall_status, sizeof(st)))
+		return;
 	for (i = 0; i < ARRAY_SIZE(st); i++) {
 		struct lguest_regs regs;
 		unsigned int n = lg->next_hcall;
-
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