Re: [RELEASE] Lguest for 2.6.21

[WANG Cong <xiyou.wangcong@gmail.com>]

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.

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

---

--- linux-2.6.21-rc7-mm2/drivers/lguest/interrupts_and_traps.c.orig	2007-05-03 03:10:44.000000000 +0800
+++ linux-2.6.21-rc7-mm2/drivers/lguest/interrupts_and_traps.c	2007-05-03 03:11:42.000000000 +0800
@@ -75,7 +75,8 @@ void maybe_do_interrupt(struct lguest *l
 		set_bit(0, lg->irqs_pending);
 
 	/* Mask out any interrupts they have blocked. */
-	copy_from_user(&blk, lg->lguest_data->blocked_interrupts, sizeof(blk));
+	if (copy_from_user(&blk, lg->lguest_data->blocked_interrupts, sizeof(blk)))
+		return;
 	bitmap_andnot(blk, lg->irqs_pending, blk, LGUEST_IRQS);
 
 	irq = find_first_bit(blk, LGUEST_IRQS);
-
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