[PATCH] f2fs: fix to return correct error number in f2fs_sync_node_pages()

[PATCH] f2fs: fix to return correct error number in f2fs_sync_node_pages()

[Chao Yu]

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@vger.kernel.org
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chao Yu <chao@kernel.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;
-- 
2.49.0

Re: [f2fs-dev] [PATCH] f2fs: fix to return correct error number in f2fs_sync_node_pages()

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Wed,  7 May 2025 16:08:38 +0800 you wrote:
> 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
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: fix to return correct error number in f2fs_sync_node_pages()
    https://git.kernel.org/jaegeuk/f2fs/c/43ba56a043b1

You are awesome, thank you!
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