linux-kernel - [PATCH v1] mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large

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Message-ID: <20241210093437.174413-1-david@redhat.com>
Date: Tue, 10 Dec 2024 10:34:37 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org,
	David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Zi Yan <ziy@...dia.com>,
	Yu Zhao <yuzhao@...gle.com>,
	stable@...r.kernel.org
Subject: [PATCH v1] mm/page_alloc: don't call pfn_to_page() on possibly non-existent PFN in split_large_buddy()

In split_large_buddy(), we might call pfn_to_page() on a PFN that might
not exist. In corner cases, such as when freeing the highest pageblock in
the last memory section, this could result with CONFIG_SPARSEMEM &&
!CONFIG_SPARSEMEM_EXTREME in __pfn_to_section() returning NULL and
and __section_mem_map_addr() dereferencing that NULL pointer.

Let's fix it, and avoid doing a pfn_to_page() call for the first
iteration, where we already have the page.

So far this was found by code inspection, but let's just CC stable as
the fix is easy.

Fixes: fd919a85cd55 ("mm: page_isolation: prepare for hygienic freelists")
Reported-by: Vlastimil Babka <vbabka@...e.cz>
Closes: https://lkml.kernel.org/r/e1a898ba-a717-4d20-9144-29df1a6c8813@suse.cz
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Zi Yan <ziy@...dia.com>
Cc: Yu Zhao <yuzhao@...gle.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 mm/page_alloc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 48a291c485df4..a52c6022c65cb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1238,13 +1238,15 @@ static void split_large_buddy(struct zone *zone, struct page *page,
 	if (order > pageblock_order)
 		order = pageblock_order;
 
-	while (pfn != end) {
+	do {
 		int mt = get_pfnblock_migratetype(page, pfn);
 
 		__free_one_page(page, pfn, zone, order, mt, fpi);
 		pfn += 1 << order;
+		if (pfn == end)
+			break;
 		page = pfn_to_page(pfn);
-	}
+	} while (1);
 }
 
 static void free_one_page(struct zone *zone, struct page *page,
-- 
2.47.1