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arm64: fix NULL dereference in have_cpu_die()
Commit5c492c3f52
("arm64: smp: Add function to determine if cpus are stuck in the kernel") added a helper function to determine if die() is supported in cpu_ops. This function assumes a cpu will have a valid cpu_ops entry, but that may not be the case for cpu0 is spin-table or parking protocol is used to boot secondary cpus. In that case, there is a NULL dereference if have_cpu_die() is called by cpu0. So add a check for a valid cpu_ops before dereferencing it. Fixes:5c492c3f52
("arm64: smp: Add function to determine if cpus are stuck in the kernel") Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -944,7 +944,7 @@ static bool have_cpu_die(void)
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#ifdef CONFIG_HOTPLUG_CPU
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int any_cpu = raw_smp_processor_id();
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if (cpu_ops[any_cpu]->cpu_die)
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if (cpu_ops[any_cpu] && cpu_ops[any_cpu]->cpu_die)
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return true;
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#endif
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return false;
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