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 <[email protected]>
---
--- 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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