ptp: Return -EFAULT on copy_to_user() errors
copy_to_user() returns the number of bytes remaining, but we want a
negative error code in ptp_ioctl.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: John Stultz <john.stultz@linaro.org>
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index a8d03ae..93fa22d 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -46,7 +46,8 @@
caps.n_ext_ts = ptp->info->n_ext_ts;
caps.n_per_out = ptp->info->n_per_out;
caps.pps = ptp->info->pps;
- err = copy_to_user((void __user *)arg, &caps, sizeof(caps));
+ if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
+ err = -EFAULT;
break;
case PTP_EXTTS_REQUEST: