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

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Date:   Mon, 21 Mar 2022 23:00:04 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     tytso@....edu
Cc:     ebiggers@...nel.org, jaegeuk@...nel.org,
        linux-ext4@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH 5/5] 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>
---
 fs/ext4/namei.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 8520115cd5c2..c321c6fdb4ae 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1456,6 +1456,9 @@ 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 file in directory");
 			return false;
 		}
 		return ret;
-- 
2.35.1