[PATCH v16 6/9] ext4: Log error when lookup of encoded dentry fails

From: Eugen Hristev <eugen.hristev@collabora.com>
To: tytso@mit.edu, adilger.kernel@dilger.ca,
	linux-ext4@vger.kernel.org, jaegeuk@kernel.org, chao@kernel.org,
	linux-f2fs-devel@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel@collabora.com,
	eugen.hristev@collabora.com, viro@zeniv.linux.org.uk,
	brauner@kernel.org, jack@suse.cz, krisman@suse.de,
	ebiggers@kernel.org,
	Gabriel Krisman Bertazi <krisman@collabora.com>
Subject: [PATCH v16 6/9] ext4: Log error when lookup of encoded dentry fails
Date: Fri,  5 Apr 2024 15:13:29 +0300	[thread overview]
Message-ID: <20240405121332.689228-7-eugen.hristev@collabora.com> (raw)
In-Reply-To: <20240405121332.689228-1-eugen.hristev@collabora.com>

From: Gabriel Krisman Bertazi <krisman@collabora.com>

If the volume is in strict mode, ext4_ci_compare can report a broken
encoding name.  This will not trigger on a bad lookup, which is caught
earlier, only if the actual disk name is bad.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
---
 fs/ext4/namei.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 2d0ee232fbe7..3268cf45d9db 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1477,6 +1477,9 @@ static bool ext4_match(struct inode *parent,
 			 * only case where it happens is on a disk
 			 * corruption or ENOMEM.
 			 */
+			if (ret == -EINVAL)
+				EXT4_ERROR_INODE(parent,
+					"Directory contains filename that is invalid UTF-8");
 			return false;
 		}
 		return ret;
-- 
2.34.1

