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/[email protected]
Fixes: e83a437 ("mm/memory_hotplug: introduce "auto-movable" online policy")
Signed-off-by: Anastasia Belova <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Acked-by: Oscar Salvador <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Anastasia Belova

mm/memory_hotplug.c

@@ -846,7 +846,6 @@ static bool auto_movable_can_online_movable(int nid, struct memory_group *group,
 	unsigned long kernel_early_pages, movable_pages;
 	struct auto_movable_group_stats group_stats = {};
 	struct auto_movable_stats stats = {};
-	pg_data_t *pgdat = NODE_DATA(nid);
 	struct zone *zone;
 	int i;
 
@@ -857,6 +856,8 @@ static bool auto_movable_can_online_movable(int nid, struct memory_group *group,
 			auto_movable_stats_account_zone(&stats, zone);
 	} else {
 		for (i = 0; i < MAX_NR_ZONES; i++) {
+			pg_data_t *pgdat = NODE_DATA(nid);
+
 			zone = pgdat->node_zones + i;
 			if (populated_zone(zone))
 				auto_movable_stats_account_zone(&stats, zone);