From 8e8505be9c0ba608cbd634faa8fba361f17d2512 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Sun, 30 Oct 2005 15:03:37 -0800 Subject: [PATCH] [PATCH] hpet: fix HPET_INFO calls from kernel space 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 Cc: Bob Picco Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/hpet.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index 8e59639fb03c..c85d11de5feb 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -500,8 +500,12 @@ hpet_ioctl_common(struct hpet_dev *devp, int cmd, unsigned long arg, int kernel) 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: -- 2.20.1