netdev - [PATCH net] e1000e: fix numeric overflow in phc settime method.

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Message-Id: <1455e8dd5f574fef93377b61cea8b494102091ef.1366638698.git.richardcochran@gmail.com>
Date:	Mon, 22 Apr 2013 15:53:36 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	<netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jeroen Van den Keybus <jeroen.vandenkeybus@...phase.com>,
	bruce.w.allan@...el.com, <e1000-devel@...ts.sourceforge.net>
Subject: [PATCH net] e1000e: fix numeric overflow in phc settime method.

The PTP Hardware Clock settime function in the e1000e driver
computes nanoseconds from a struct timespec. The code converts the
seconds field .tv_sec by multiplying it with NSEC_PER_SEC. However,
both operands are of type long, resulting in an unintended overflow.
The patch fixes the issue by using the helper function from time.h.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 drivers/net/ethernet/intel/e1000e/ptp.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c
index b477fa5..065f8c8 100644
--- a/drivers/net/ethernet/intel/e1000e/ptp.c
+++ b/drivers/net/ethernet/intel/e1000e/ptp.c
@@ -145,8 +145,7 @@ static int e1000e_phc_settime(struct ptp_clock_info *ptp,
 	unsigned long flags;
 	u64 ns;
 
-	ns = ts->tv_sec * NSEC_PER_SEC;
-	ns += ts->tv_nsec;
+	ns = timespec_to_ns(ts);
 
 	/* reset the timecounter */
 	spin_lock_irqsave(&adapter->systim_lock, flags);
-- 
1.7.2.5

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