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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-08-06 02:26:22 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-14 22:59:07 -0700
commitb97f921b94b1e70d5de999fd820ccf8504dc6528 (patch)
tree66c405bdc3086d5519c2d16ce07a65016d2967f2 /include/linux
parentda712f3a8c493986b19fd0863b45607c34061ba6 (diff)
downloadvexpress-lsk-b97f921b94b1e70d5de999fd820ccf8504dc6528.tar.gz
ACPI / PM: Walk physical_node_list under physical_node_lock
commit 623cf33cb055b1e81fa47e4fc16789b2c129e31e upstream. The list of physical devices corresponding to an ACPI device object is walked by acpi_system_wakeup_device_seq_show() and physical_device_enable_wakeup() without taking that object's physical_node_lock mutex. Since each of those functions may be run at any time as a result of a user space action, the lack of appropriate locking in them may lead to a kernel crash if that happens during device hot-add or hot-remove involving the device object in question. Fix the issue by modifying acpi_system_wakeup_device_seq_show() and physical_device_enable_wakeup() to use physical_node_lock as appropriate. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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