linux-kernel - Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_remove_btree

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tencent_EAA3769F66F63CDD377096D836204AF47509@qq.com>
Date: Thu, 27 Nov 2025 11:02:15 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f82afc4d4e74d0ef7a89@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_remove_btree_range (2)

#syz test

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 162711cc5b20..570d747a00ca 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -6164,7 +6164,7 @@ static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
 	struct buffer_head *bh = NULL;
 	struct ocfs2_dinode *di;
 	struct ocfs2_truncate_log *tl;
-	unsigned int tl_count;
+	unsigned int tl_count, tl_used;
 
 	inode = ocfs2_get_system_file_inode(osb,
 					   TRUNCATE_LOG_SYSTEM_INODE,
@@ -6185,8 +6185,10 @@ static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
 	di = (struct ocfs2_dinode *)bh->b_data;
 	tl = &di->id2.i_dealloc;
 	tl_count = le16_to_cpu(tl->tl_count);
+	tl_used = le16_to_cpu(tl->tl_used);
 	if (unlikely(tl_count > ocfs2_truncate_recs_per_inode(osb->sb) ||
-		     tl_count == 0)) {
+		     tl_count == 0) ||
+		     tl_used > tl_count) {
 		status = -EFSCORRUPTED;
 		iput(inode);
 		brelse(bh);