numa: fix NULL pointer access and memory leak in unregister_one_node()
When doing socket hot remove, "node_devices[nid]" is set to NULL; acpi_processor_remove() try_offline_node() unregister_one_node() Then hot add a socket, but do not echo 1 > /sys/devices/system/cpu/cpuXX/online, so register_one_node() will not be called, and "node_devices[nid]" is still NULL. If doing socket hot remove again, NULL pointer access will be happen. unregister_one_node() unregister_node() Another, we should free the memory used by "node_devices[nid]" in unregister_one_node(). Signed-off-by: Xishi Qiu <qiuxishi@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -599,7 +599,11 @@ int register_one_node(int nid)
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void unregister_one_node(int nid)
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void unregister_one_node(int nid)
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{
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{
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if (!node_devices[nid])
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return;
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unregister_node(node_devices[nid]);
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unregister_node(node_devices[nid]);
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kfree(node_devices[nid]);
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node_devices[nid] = NULL;
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node_devices[nid] = NULL;
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}
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}
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