Re: [syzbot] [exfat?] WARNING in __rt_mutex_slowlock_locked (2)

[Namjae Jeon <linkinjeon@kernel.org>]

[-- Attachment #1: Type: text/plain, Size: 10 bytes --]

#syz test

[-- Attachment #2: 0001-exfat-return-error-if-start_clu-is-invalid.patch --]
[-- Type: text/x-patch, Size: 954 bytes --]

From 25892e8de955d717859f02e8da65c109156c4ee1 Mon Sep 17 00:00:00 2001
From: Namjae Jeon <linkinjeon@kernel.org>
Date: Fri, 7 Nov 2025 16:27:10 +0900
Subject: [PATCH] exfat: return error if ->start_clu is invalid

Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/exfat/namei.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 745dce29ddb5..4dd09da1aa92 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -657,10 +657,9 @@ static int exfat_find(struct inode *dir, const struct qstr *qname,
 
 	info->start_clu = le32_to_cpu(ep2->dentry.stream.start_clu);
 	if (!is_valid_cluster(sbi, info->start_clu) && info->size) {
-		exfat_warn(sb, "start_clu is invalid cluster(0x%x)",
+		exfat_fs_error(sb, "start_clu is invalid cluster(0x%x)",
 				info->start_clu);
-		info->size = 0;
-		info->valid_size = 0;
+		return -EIO;
 	}
 
 	if (info->valid_size > info->size) {
-- 
2.25.1