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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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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