sched: Ensure 'sched_domains_numa_levels' is safe to use in other functions
We should temporarily reset 'sched_domains_numa_levels' to 0 after it is reset to 'level' in sched_init_numa(). If it fails to allocate memory for array sched_domains_numa_masks[][], the array will contain less then 'level' members. This could be dangerous when we use it to iterate array sched_domains_numa_masks[][] in other functions. This patch set sched_domains_numa_levels to 0 before initializing array sched_domains_numa_masks[][], and reset it to 'level' when sched_domains_numa_masks[][] is fully initialized. Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1348578751-16904-2-git-send-email-tangchen@cn.fujitsu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -6122,6 +6122,17 @@ static void sched_init_numa(void)
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* numbers.
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* numbers.
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*/
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*/
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/*
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* Here, we should temporarily reset sched_domains_numa_levels to 0.
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* If it fails to allocate memory for array sched_domains_numa_masks[][],
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* the array will contain less then 'level' members. This could be
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* dangerous when we use it to iterate array sched_domains_numa_masks[][]
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* in other functions.
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*
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* We reset it to 'level' at the end of this function.
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*/
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sched_domains_numa_levels = 0;
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sched_domains_numa_masks = kzalloc(sizeof(void *) * level, GFP_KERNEL);
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sched_domains_numa_masks = kzalloc(sizeof(void *) * level, GFP_KERNEL);
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if (!sched_domains_numa_masks)
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if (!sched_domains_numa_masks)
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return;
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return;
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@ -6176,6 +6187,8 @@ static void sched_init_numa(void)
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}
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}
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sched_domain_topology = tl;
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sched_domain_topology = tl;
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sched_domains_numa_levels = level;
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}
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}
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#else
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#else
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static inline void sched_init_numa(void)
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static inline void sched_init_numa(void)
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