From: Clemens Ladisch <[email protected]>
Fix a wrong memory access in hpet_ioctl_common(). It was not possible
to use the HPET_INFO ioctl from kernel space because it always called
copy_to_user().
Signed-off-by: Clemens Ladisch <[email protected]>
Index: linux-2.6.13/drivers/char/hpet.c
===================================================================
--- linux-2.6.13.orig/drivers/char/hpet.c 2005-10-03 22:53:09.000000000 +0200
+++ linux-2.6.13/drivers/char/hpet.c 2005-10-03 22:53:12.000000000 +0200
@@ -500,8 +500,12 @@ hpet_ioctl_common(struct hpet_dev *devp,
readq(&timer->hpet_config) & Tn_PER_INT_CAP_MASK;
info.hi_hpet = devp->hd_hpets->hp_which;
info.hi_timer = devp - devp->hd_hpets->hp_dev;
- if (copy_to_user((void __user *)arg, &info, sizeof(info)))
- err = -EFAULT;
+ if (kernel)
+ memcpy((void *)arg, &info, sizeof(info));
+ else
+ if (copy_to_user((void __user *)arg, &info,
+ sizeof(info)))
+ err = -EFAULT;
break;
}
case HPET_EPI:
-
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