Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 014/134] intel_idle: Check cpu_idle_get_driver() for NULL before dereferencing it. | Date | Wed, 9 Apr 2014 20:22:10 -0700 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
commit 3735d524da64b70b41c764359da36f88aded3610 upstream.
If the machine is booted without any cpu_idle driver set (b/c disable_cpuidle() has been called) we should follow other users of cpu_idle API and check the return value for NULL before using it.
Reported-and-tested-by: Mark van Dijk <mark@internecto.net> Suggested-by: Jan Beulich <JBeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Daniel Kiper <daniel.kiper@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/idle/intel_idle.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -594,8 +594,9 @@ static int __init intel_idle_init(void) intel_idle_cpuidle_driver_init(); retval = cpuidle_register_driver(&intel_idle_driver); if (retval) { + struct cpuidle_driver *drv = cpuidle_get_driver(); printk(KERN_DEBUG PREFIX "intel_idle yielding to %s", - cpuidle_get_driver()->name); + drv ? drv->name : "none"); return retval; }
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