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authorClemens Ladisch <clemens@ladisch.de>2005-10-30 15:03:37 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:30 -0800
commit8e8505be9c0ba608cbd634faa8fba361f17d2512 (patch)
treedcb75f543bb9b75b8c6bf0260f2b5f5283533c7e
parent7811fb8f400a3dbfa027d86bb583a31c66fddfc3 (diff)
downloadop-kernel-dev-8e8505be9c0ba608cbd634faa8fba361f17d2512.zip
op-kernel-dev-8e8505be9c0ba608cbd634faa8fba361f17d2512.tar.gz
[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 <clemens@ladisch.de> Cc: Bob Picco <bob.picco@hp.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/char/hpet.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index 8e59639..c85d11d 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:
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