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| author | Jon Medhurst (Tixy) <tixy@linaro.org> | 2012-08-15 22:11:00 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-08-17 19:37:08 +0200 |
| commit | 5fbbb90dfdedb9a258550e4e5debd3013266372e (patch) | |
| tree | 86f4ad339e193301a8ac2626cc28e664978089b7 /drivers/cpuidle/coupled.c | |
| parent | 63c6ba4352009a5f85b32307c001abeb5baebd28 (diff) | |
| download | linux-5fbbb90dfdedb9a258550e4e5debd3013266372e.tar.gz linux-5fbbb90dfdedb9a258550e4e5debd3013266372e.tar.bz2 linux-5fbbb90dfdedb9a258550e4e5debd3013266372e.zip | |
cpuidle: Prevent null pointer dereference in cpuidle_coupled_cpu_notify
When a kernel is built to support multiple hardware types it's possible
that CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED is set but the hardware the
kernel is run on doesn't support cpuidle and therefore doesn't load a
driver for it. In this case, when the system is shut down,
cpuidle_coupled_cpu_notify() gets called with cpuidle_devices set to
NULL. There are quite possibly other circumstances where this
situation can also occur and we should check for it.
Signed-off-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/cpuidle/coupled.c')
| -rw-r--r-- | drivers/cpuidle/coupled.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c index c24dda03c143..3265844839bf 100644 --- a/drivers/cpuidle/coupled.c +++ b/drivers/cpuidle/coupled.c @@ -693,7 +693,7 @@ static int cpuidle_coupled_cpu_notify(struct notifier_block *nb, mutex_lock(&cpuidle_lock); dev = per_cpu(cpuidle_devices, cpu); - if (!dev->coupled) + if (!dev || !dev->coupled) goto out; switch (action & ~CPU_TASKS_FROZEN) { |