From 02a9079c66341836c4914c33c06a73245060df2e Mon Sep 17 00:00:00 2001 From: Vlad Tsyrklevich Date: Tue, 11 Oct 2016 15:02:47 +0200 Subject: [PATCH] drivers/ptp: Fix kernel memory disclosure 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 Acked-by: Richard Cochran Signed-off-by: David S. Miller --- drivers/ptp/ptp_chardev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index d637c933c8a9..58a97d420572 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -193,6 +193,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) 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; -- 2.20.1