mm/memory_hotplug: prevent accessing by index=-1
nid may be equal to NUMA_NO_NODE=-1. Prevent accessing node_data array by
invalid index with check for nid.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Link: https://lkml.kernel.org/r/20240606080659.18525-1-abelova@astralinux.ru
Fixes: e83a437faa
("mm/memory_hotplug: introduce "auto-movable" online policy")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -846,7 +846,6 @@ static bool auto_movable_can_online_movable(int nid, struct memory_group *group,
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unsigned long kernel_early_pages, movable_pages;
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struct auto_movable_group_stats group_stats = {};
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struct auto_movable_stats stats = {};
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pg_data_t *pgdat = NODE_DATA(nid);
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struct zone *zone;
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int i;
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@ -857,6 +856,8 @@ static bool auto_movable_can_online_movable(int nid, struct memory_group *group,
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auto_movable_stats_account_zone(&stats, zone);
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} else {
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for (i = 0; i < MAX_NR_ZONES; i++) {
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pg_data_t *pgdat = NODE_DATA(nid);
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zone = pgdat->node_zones + i;
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if (populated_zone(zone))
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auto_movable_stats_account_zone(&stats, zone);
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