diff options
Diffstat (limited to 'drivers/ptp/ptp_chardev.c')
| -rw-r--r-- | drivers/ptp/ptp_chardev.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index bf6468c56419..4380e6ddb849 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -205,6 +205,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_EXTTS_REQUEST: case PTP_EXTTS_REQUEST2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; + break; + } memset(&req, 0, sizeof(req)); if (copy_from_user(&req.extts, (void __user *)arg, @@ -246,6 +250,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_PEROUT_REQUEST: case PTP_PEROUT_REQUEST2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; + break; + } memset(&req, 0, sizeof(req)); if (copy_from_user(&req.perout, (void __user *)arg, @@ -314,6 +322,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_ENABLE_PPS: case PTP_ENABLE_PPS2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; + break; + } memset(&req, 0, sizeof(req)); if (!capable(CAP_SYS_TIME)) @@ -456,6 +468,10 @@ long ptp_ioctl(struct posix_clock_context *pccontext, unsigned int cmd, case PTP_PIN_SETFUNC: case PTP_PIN_SETFUNC2: + if ((pccontext->fp->f_mode & FMODE_WRITE) == 0) { + err = -EACCES; + break; + } if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { err = -EFAULT; break; |