[3.5.y.z extended stable] Patch "timekeeping: fix 32-bit overflow in get_monotonic_boottime" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    timekeeping: fix 32-bit overflow in get_monotonic_boottime

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From c806968ddac47ed88392bf64cc03ca09067246a8 Mon Sep 17 00:00:00 2001
From: Colin Cross <ccross at android.com>
Date: Mon, 10 Feb 2014 13:16:29 -0800
Subject: timekeeping: fix 32-bit overflow in get_monotonic_boottime

get_monotonic_boottime adds three nanonsecond values stored
in longs, followed by an s64.  If the long values are all
close to 1e9 the first three additions can overflow and
become negative when added to the s64.  Cast the first
value to s64 so that all additions are 64 bit.

Signed-off-by: Colin Cross <ccross at android.com>
[jstultz: Fished this out of the AOSP commong.git tree. This was
fixed upstream in v3.6 by ec145babe754f9ea1079034a108104b6001e001c]
Signed-off-by: John Stultz <john.stultz at linaro.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 kernel/time/timekeeping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index a9ae4bd..3988562 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1196,7 +1196,7 @@ void get_monotonic_boottime(struct timespec *ts)
 	} while (read_seqretry(&timekeeper.lock, seq));

 	set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec + sleep.tv_sec,
-			ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs);
+		(s64)ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs);
 }
 EXPORT_SYMBOL_GPL(get_monotonic_boottime);

--
1.8.3.2