linux-kernel - [PATCH 1/6] f2fs: fix to return correct error number in f2fs_sync_node

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Message-ID: <20250508051520.4169795-2-hch@lst.de>
Date: Thu,  8 May 2025 07:14:27 +0200
From: Christoph Hellwig <hch@....de>
To: Jaegeuk Kim <jaegeuk@...nel.org>,
	Chao Yu <chao@...nel.org>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH 1/6] f2fs: fix to return correct error number in f2fs_sync_node_pages()

From: Chao Yu <chao@...nel.org>

If __write_node_folio() failed, it will return AOP_WRITEPAGE_ACTIVATE,
the incorrect return value may be passed to userspace in below path,
fix it.

- sync_filesystem
 - sync_fs
  - f2fs_issue_checkpoint
   - block_operations
    - f2fs_sync_node_pages
     - __write_node_folio
     : return AOP_WRITEPAGE_ACTIVATE

Cc: stable@...r.kernel.org
Reported-by: Christoph Hellwig <hch@....de>
Signed-off-by: Chao Yu <chao@...nel.org>
---
 fs/f2fs/node.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ec74eb9982a5..69308523c34e 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2092,10 +2092,14 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
 
 			ret = __write_node_folio(folio, false, &submitted,
 						wbc, do_balance, io_type, NULL);
-			if (ret)
+			if (ret) {
 				folio_unlock(folio);
-			else if (submitted)
+				folio_batch_release(&fbatch);
+				ret = -EIO;
+				goto out;
+			} else if (submitted) {
 				nwritten++;
+			}
 
 			if (--wbc->nr_to_write == 0)
 				break;
-- 
2.47.2