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mm: compaction: avoid possible NULL pointer dereference in kcompactd_cpu_online

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It's possible that kcompactd_run could fail to run kcompactd for a hot
added node and leave pgdat->kcompactd as NULL.  So pgdat->kcompactd should
be checked here to avoid possible NULL pointer dereference.

Link: https://lkml.kernel.org/r/20220418141253.24298-10-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Charan Teja Kalla <charante@codeaurora.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Pintu Kumar <pintu@codeaurora.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-04-28 23:16:18 -07:00 committed by akpm
parent 556162bf3a
commit 3109de3089
1 changed files with 2 additions and 1 deletions
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3
mm/compaction.c
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@ -3052,7 +3052,8 @@ static int kcompactd_cpu_online(unsigned int cpu)
if (cpumask_any_and(cpu_online_mask, mask) < nr_cpu_ids)
/* One of our CPUs online: restore mask */
set_cpus_allowed_ptr(pgdat->kcompactd, mask);
if (pgdat->kcompactd)
set_cpus_allowed_ptr(pgdat->kcompactd, mask);
}
return 0;
}