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| author | Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com> | 2017-08-01 09:11:52 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-08-01 14:20:53 +0200 |
| commit | 34f41c0316ed52b0b44542491d89278efdaa70e4 (patch) | |
| tree | 516368a46aae4e9b50b31457947b66649a3dccff /kernel | |
| parent | 16f73eb02d7e1765ccab3d2018e0bd98eb93d973 (diff) | |
| download | linux-34f41c0316ed52b0b44542491d89278efdaa70e4.tar.gz linux-34f41c0316ed52b0b44542491d89278efdaa70e4.tar.bz2 linux-34f41c0316ed52b0b44542491d89278efdaa70e4.zip | |
timers: Fix overflow in get_next_timer_interrupt
For e.g. HZ=100, timer being 430 jiffies in the future, and 32 bit
unsigned int, there is an overflow on unsigned int right-hand side
of the expression which results with wrong values being returned.
Type cast the multiplier to 64bit to avoid that issue.
Fixes: 46c8f0b077a8 ("timers: Fix get_next_timer_interrupt() computation")
Signed-off-by: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Cc: khilman@baylibre.com
Cc: akpm@linux-foundation.org
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/a7900f04-2a21-c9fd-67be-ab334d459ee5@nokia.com
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/timer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 71ce3f4eead3..8f5d1bf18854 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1495,7 +1495,7 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem) base->is_idle = false; } else { if (!is_max_delta) - expires = basem + (nextevt - basej) * TICK_NSEC; + expires = basem + (u64)(nextevt - basej) * TICK_NSEC; /* * If we expect to sleep more than a tick, mark the base idle: */ |