Bad array index in arch/x86/mm/numa_64.c::debug_cpumask_set_cpu()

[Jesper Juhl]

Hi,

In arch/x86/mm/numa_64.c::debug_cpumask_set_cpu() we call 
early_cpu_to_node() which may return NUMA_NO_NODE (which has the value 
-1). This value is subsequently used as an index into 
the 'node_to_cpumask_map' array and '-1' is not going to fly too wel as an 
array index here.

This code comes from commit d906f0eb2f0e6d1a24c479f69a9c39e7e45c5ae8
"x86, numa: Fix CONFIG_DEBUG_PER_CPU_MAPS without NUMA emulation".

I must admit I have no idea what the best way to deal with this is, so 
I'll just report it.

Happy bug fixing.

-- 
Jesper Juhl <jj@xxxxxxxxxxxxx>            http://www.chaosbits.net/
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