e1000e: fix numeric overflow in phc settime method
authorRichard Cochran <richardcochran@gmail.com>
Tue, 23 Apr 2013 01:56:34 +0000 (01:56 +0000)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Fri, 26 Apr 2013 01:30:02 +0000 (18:30 -0700)
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.

CC: stable <stable@vger.kernel.org>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
drivers/net/ethernet/intel/e1000e/ptp.c

index b477fa53ec94f1ed9e25e5ea0e04cd9025f74573..065f8c80d4f2d751e2cd2763f3bd6d1e73b6ab9b 100644 (file)
@@ -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);