From: David Engraf Date: Tue, 19 Mar 2013 12:29:55 +0000 (+0100) Subject: hrtimer: Fix ktime_add_ns() overflow on 32bit architectures X-Git-Tag: upstream/snapshot3+hdmi~5269^2~11 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=51fd36f3fad8447c487137ae26b9d0b3ce77bb25;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git hrtimer: Fix ktime_add_ns() overflow on 32bit architectures One can trigger an overflow when using ktime_add_ns() on a 32bit architecture not supporting CONFIG_KTIME_SCALAR. When passing a very high value for u64 nsec, e.g. 7881299347898368000 the do_div() function converts this value to seconds (7881299347) which is still to high to pass to the ktime_set() function as long. The result in is a negative value. The problem on my system occurs in the tick-sched.c, tick_nohz_stop_sched_tick() when time_delta is set to timekeeping_max_deferment(). The check for time_delta < KTIME_MAX is valid, thus ktime_add_ns() is called with a too large value resulting in a negative expire value. This leads to an endless loop in the ticker code: time_delta: 7881299347898368000 expires = ktime_add_ns(last_update, time_delta) expires: negative value This fix caps the value to KTIME_MAX. This error doesn't occurs on 64bit or architectures supporting CONFIG_KTIME_SCALAR (e.g. ARM, x86-32). Cc: stable@vger.kernel.org Signed-off-by: David Engraf [jstultz: Minor tweaks to commit message & header] Signed-off-by: John Stultz --- diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index 071e093..c0875ae 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -286,6 +286,10 @@ ktime_t ktime_add_ns(const ktime_t kt, u64 nsec) } else { unsigned long rem = do_div(nsec, NSEC_PER_SEC); + /* Make sure nsec fits into long */ + if (unlikely(nsec > KTIME_SEC_MAX)) + return (ktime_t){ .tv64 = KTIME_MAX }; + tmp = ktime_set((long)nsec, rem); }