linux-kernel - [PATCH v3 1/5] mm: shmem: avoid unpaired folio_unlock() in shmem_swapin

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Message-Id: <20250516170939.965736-2-shikemeng@huaweicloud.com>
Date: Sat, 17 May 2025 01:09:35 +0800
From: Kemeng Shi <shikemeng@...weicloud.com>
To: hughd@...gle.com,
	baolin.wang@...ux.alibaba.com,
	akpm@...ux-foundation.org
Cc: ryncsn@...il.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/5] mm: shmem: avoid unpaired folio_unlock() in shmem_swapin_folio()

If we get a folio from swap_cache_get_folio() successfully but encounter
a failure before the folio is locked, we will unlock the folio which was
not previously locked.
Put the folio and set it to NULL when a failure occurs before the folio
is locked to fix the issue.

Fixes: 058313515d5aa ("mm: shmem: fix potential data corruption during shmem swapin")
Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
Reviewed-by: Kairui Song <kasong@...cent.com>
---
 mm/shmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 99327c30507c..980fa15f393e 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2335,6 +2335,8 @@ static int shmem_swapin_folio(struct inode *inode, pgoff_t index,
 		 */
 		split_order = shmem_split_large_entry(inode, index, swap, gfp);
 		if (split_order < 0) {
+			folio_put(folio);
+			folio = NULL;
 			error = split_order;
 			goto failed;
 		}
-- 
2.30.0