linux-kernel - Syzbot testing for ocfs2: Fix kernel BUG in ocfs2_write

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Message-ID: <20251206152000.174746-1-activprithvi@gmail.com>
Date: Sat,  6 Dec 2025 20:49:59 +0530
From: Prithvi Tambewagh <activprithvi@...il.com>
To: syzbot+c818e5c4559444f88aa0@...kaller.appspotmail.com,
	jlbec@...lplan.org,
	joseph.qi@...ux.alibaba.com,
	mark@...heh.com
Cc: linux-kernel@...r.kernel.org,
	ocfs2-devel@...ts.linux.dev,
	syzkaller-bugs@...glegroups.com,
	Prithvi Tambewagh <activprithvi@...il.com>
Subject: Syzbot testing for ocfs2: Fix kernel BUG in ocfs2_write_block

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 24172e0d79900908cf5ebf366600616d29c9b417

Signed-off-by: Prithvi Tambewagh <activprithvi@...il.com>
---
 fs/ocfs2/slot_map.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c
index e544c704b583..788924fc3663 100644
--- a/fs/ocfs2/slot_map.c
+++ b/fs/ocfs2/slot_map.c
@@ -193,6 +193,16 @@ static int ocfs2_update_disk_slot(struct ocfs2_super *osb,
 	else
 		ocfs2_update_disk_slot_old(si, slot_num, &bh);
 	spin_unlock(&osb->osb_lock);
+	if (bh->b_blocknr < OCFS2_SUPER_BLOCK_BLKNO) {
+		status = ocfs2_error(osb->sb,
+				     "Invalid Slot Map Buffer Head "
+				     "Block Number : %llu, Should be >= %d",
+				     le16_to_cpu(bh->b_blocknr),
+				     le16_to_cpu((int)OCFS2_SUPER_BLOCK_BLKNO));
+		if (!status)
+			return -EIO;
+		return status;
+	}
 
 	status = ocfs2_write_block(osb, bh, INODE_CACHE(si->si_inode));
 	if (status < 0)

base-commit: 24172e0d79900908cf5ebf366600616d29c9b417
-- 
2.43.0