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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-07-11 14:26:34 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-07-11 14:26:34 +0200 |
| commit | c4d029f2d43b39de7b9299e8b58102a442ba86f8 (patch) | |
| tree | c0d36234d8108f43a76212d12b437bdf1b752aa8 /kernel | |
| parent | 1f6823faa8c563431a94e614d2b63ce16bb6f658 (diff) | |
| download | lwn-c4d029f2d43b39de7b9299e8b58102a442ba86f8.tar.gz lwn-c4d029f2d43b39de7b9299e8b58102a442ba86f8.zip | |
tick/broadcast: Prevent NULL pointer dereference
Dan reported that the recent changes to the broadcast code introduced
a potential NULL dereference.
Add the proper check.
Fixes: e0454311903d "tick/broadcast: Sanity check the shutdown of the local clock_event"
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/tick-broadcast.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c index ee3cf942d6eb..52b9e199b5ac 100644 --- a/kernel/time/tick-broadcast.c +++ b/kernel/time/tick-broadcast.c @@ -409,14 +409,16 @@ void tick_broadcast_control(enum tick_broadcast_mode mode) break; } - if (cpumask_empty(tick_broadcast_mask)) { - if (!bc_stopped) - clockevents_shutdown(bc); - } else if (bc_stopped) { - if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) - tick_broadcast_start_periodic(bc); - else - tick_broadcast_setup_oneshot(bc); + if (bc) { + if (cpumask_empty(tick_broadcast_mask)) { + if (!bc_stopped) + clockevents_shutdown(bc); + } else if (bc_stopped) { + if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) + tick_broadcast_start_periodic(bc); + else + tick_broadcast_setup_oneshot(bc); + } } raw_spin_unlock(&tick_broadcast_lock); } |