linux-kernel - Re: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_count

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Message-ID: <tencent_BC66CF1362C363496C83ADE45C377E776D05@qq.com>
Date: Tue, 28 Oct 2025 23:10:29 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+7d1563afac6cb196a444@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] KASAN: use-after-free Read in hpfs_count_dnodes

#syz test

diff --git a/fs/hpfs/map.c b/fs/hpfs/map.c
index be73233502f8..9036f1ee581d 100644
--- a/fs/hpfs/map.c
+++ b/fs/hpfs/map.c
@@ -257,7 +257,7 @@ struct dnode *hpfs_map_dnode(struct super_block *s, unsigned secno,
 			     struct quad_buffer_head *qbh)
 {
 	struct dnode *dnode;
-	if (hpfs_sb(s)->sb_chk) {
+	/*if (hpfs_sb(s)->sb_chk)*/ {
 		if (hpfs_chk_sectors(s, secno, 4, "dnode")) return NULL;
 		if (secno & 3) {
 			hpfs_error(s, "dnode %08x not byte-aligned", secno);