linux-ext4 - [PATCH v2 5/7] ext4: Log error when lookup of encoded dentry fails

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Date:   Thu, 28 Apr 2022 18:10:25 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org
Cc:     linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        ebiggers@...nel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH v2 5/7] ext4: Log error when lookup of encoded dentry fails

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@...labora.com>

---

Changes since v1:
  - reword error message "file in directory" -> "filename" (Eric)
---
 fs/ext4/namei.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index e450e52eef48..d53c8d101099 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1457,6 +1457,9 @@ 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,
+						 "Bad encoded filename");
 			return false;
 		}
 		return ret;
-- 
2.35.1