sched: Avoid NULL dereference on sd_busy
Commit 37dc6b50ce
("sched: Remove unnecessary iteration over sched
domains to update nr_busy_cpus") forgot to clear 'sd_busy' under some
conditions leading to a possible NULL deref in set_cpu_sd_state_idle().
Reported-by: Anton Blanchard <anton@samba.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20131118113701.GF3866@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Родитель
9abf24d465
Коммит
42eb088ed2
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@ -4910,8 +4910,9 @@ static void update_top_cache_domain(int cpu)
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if (sd) {
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id = cpumask_first(sched_domain_span(sd));
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size = cpumask_weight(sched_domain_span(sd));
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rcu_assign_pointer(per_cpu(sd_busy, cpu), sd->parent);
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sd = sd->parent; /* sd_busy */
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}
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rcu_assign_pointer(per_cpu(sd_busy, cpu), sd);
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rcu_assign_pointer(per_cpu(sd_llc, cpu), sd);
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per_cpu(sd_llc_size, cpu) = size;
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