linux-kernel - [PATCH] mm/memory_hotplug: fix kfree() of bootmem memory

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Message-ID: <20220207135618.17231-1-linmiaohe@huawei.com>
Date:   Mon, 7 Feb 2022 21:56:18 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <isimatu.yasuaki@...fujitsu.com>, <toshi.kani@...com>,
        <david@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH] mm/memory_hotplug: fix kfree() of bootmem memory

We can't use kfree() to release the resource as it might come from bootmem.
Use release_mem_region() instead.

Fixes: ebff7d8f270d ("mem hotunplug: fix kfree() of bootmem memory")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/memory_hotplug.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7dc7e12302db..dc570772b4b1 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -216,8 +216,7 @@ static void release_memory_resource(struct resource *res)
 {
 	if (!res)
 		return;
-	release_resource(res);
-	kfree(res);
+	release_mem_region(res->start, resource_size(res));
 }
 
 static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
-- 
2.23.0