linux-kernel - [PATCH] mm/memory_hotplug: prevent accessing by index=-1

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Message-Id: <20240603112830.7432-1-abelova@astralinux.ru>
Date: Mon,  3 Jun 2024 14:28:30 +0300
From: Anastasia Belova <abelova@...ralinux.ru>
To: David Hildenbrand <david@...hat.com>
Cc: Anastasia Belova <abelova@...ralinux.ru>,
	Oscar Salvador <osalvador@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH] 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.

Fixes: e83a437faa62 ("mm/memory_hotplug: introduce "auto-movable" online policy")
Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
---
 mm/memory_hotplug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 431b1f6753c0..bb98ee8fe698 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -846,7 +846,7 @@ 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);
+	pg_data_t *pgdat = (nid != NUMA_NO_NODE) ? NODE_DATA(nid) : NULL;
 	struct zone *zone;
 	int i;
 
-- 
2.30.2