diff options
| author | Thomas Gleixner <[email protected]> | 2016-12-15 12:10:37 +0100 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2016-12-15 12:25:13 +0100 |
| commit | c1a9eeb938b5433947e5ea22f89baff3182e7075 (patch) | |
| tree | b6ebcc09e7d73f78a5f57b1e0ad796655f23586f | |
| parent | f082f02c4731900a5065de69eb0d8cb5aab66196 (diff) | |
tick/broadcast: Prevent NULL pointer dereference
When a disfunctional timer, e.g. dummy timer, is installed, the tick core
tries to setup the broadcast timer.
If no broadcast device is installed, the kernel crashes with a NULL pointer
dereference in tick_broadcast_setup_oneshot() because the function has no
sanity check.
Reported-by: Mason <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Anna-Maria Gleixner <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Peter Zijlstra <[email protected]>,
Cc: Sebastian Frias <[email protected]>
Cc: Thibaud Cornic <[email protected]>
Cc: Robin Murphy <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
| -rw-r--r-- | kernel/time/tick-broadcast.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index f6aae7977824..d2a20e83ebae 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -871,6 +871,9 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc) { int cpu = smp_processor_id(); + if (!bc) + return; + /* Set it up only once ! */ if (bc->event_handler != tick_handle_oneshot_broadcast) { int was_periodic = clockevent_state_periodic(bc); |