linux-kernel - [PATCH 2/3] f2fs: fix error path of ->symlink

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Date:	Thu, 22 Oct 2015 18:23:08 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] f2fs: fix error path of ->symlink

Now, in ->symlink of f2fs, we kept the fixed invoking order between
f2fs_add_link and page_symlink since we should init node info firstly
in f2fs_add_link, then such node info can be used in page_symlink.

But we didn't fix to release meta info which was done before page_symlink
in our error path, so this will leave us corrupt symlink entry in its
parent's dentry page. Fix this issue by adding f2fs_unlink in the error
path for removing such linking.

Signed-off-by: Chao Yu <chao2.yu@...sung.com>
---
 fs/f2fs/namei.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index dfa01c8..e48b80c 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -410,11 +410,14 @@ err_out:
 	 * If the symlink path is stored into inline_data, there is no
 	 * performance regression.
 	 */
-	if (!err)
+	if (!err) {
 		filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1);
 
-	if (IS_DIRSYNC(dir))
-		f2fs_sync_fs(sbi->sb, 1);
+		if (IS_DIRSYNC(dir))
+			f2fs_sync_fs(sbi->sb, 1);
+	} else {
+		f2fs_unlink(dir, dentry);
+	}
 
 	kfree(sd);
 	f2fs_fname_crypto_free_buffer(&disk_link);
-- 
2.6.1


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