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authorDan Carpenter <error27@gmail.com>2011-05-29 23:53:12 +0400
committerJohn Stultz <john.stultz@linaro.org>2011-06-02 06:29:08 +0400
commite23ef227d10878ff3f323a1dfed10205a1825b71 (patch)
tree175dedf039bee62658960c270643f5cbc019cdb1 /drivers/ptp
parent1fa7b6a29c61358cc2ca6f64cef4aa0e1a7ca74c (diff)
downloadlinux-e23ef227d10878ff3f323a1dfed10205a1825b71.tar.xz
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>
Diffstat (limited to 'drivers/ptp')
-rw-r--r--drivers/ptp/ptp_chardev.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index a8d03aeb4051..93fa22de5977 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -46,7 +46,8 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
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: