4.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vlad Tsyrklevich <vlad@xxxxxxxxxxxxxxx> [ Upstream commit 02a9079c66341836c4914c33c06a73245060df2e ] The reserved field precise_offset->rsv is not cleared before being copied to user space, leaking kernel stack memory. Clear the struct before it's copied. Signed-off-by: Vlad Tsyrklevich <vlad@xxxxxxxxxxxxxxx> Acked-by: Richard Cochran <richardcochran@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/ptp/ptp_chardev.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -193,6 +193,7 @@ long ptp_ioctl(struct posix_clock *pc, u if (err) break; + memset(&precise_offset, 0, sizeof(precise_offset)); ts = ktime_to_timespec64(xtstamp.device); precise_offset.device.sec = ts.tv_sec; precise_offset.device.nsec = ts.tv_nsec; -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html