linux-kernel - [PATCH] memblock: fix crash when reserved memory is not added to memory

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Date: Thu, 18 Jan 2024 14:18:53 +0800
From: Yajun Deng <yajun.deng@...ux.dev>
To: rppt@...nel.org,
	akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH] memblock: fix crash when reserved memory is not added to memory

After commit 61167ad5fecd ("mm: pass nid to reserve_bootmem_region()"),
we set nid on all reserved pages based on memory region, but some reserved
memory may not be added to memory on certain architectures. The nid is
invalid.

Add the nid check, make sure the nid is valid by early_pfn_to_nid().

Fixes: 61167ad5fecd ("mm: pass nid to reserve_bootmem_region()")
Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
---
 mm/memblock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/memblock.c b/mm/memblock.c
index abd92869874d..4dcb2ee35eca 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -2176,6 +2176,9 @@ static void __init memmap_init_reserved_pages(void)
 			start = region->base;
 			end = start + region->size;
 
+			if (nid == NUMA_NO_NODE || nid >= MAX_NUMNODES)
+				nid = early_pfn_to_nid(PFN_DOWN(start));
+
 			reserve_bootmem_region(start, end, nid);
 		}
 	}
-- 
2.25.1