linux-kernel - [PATCH AUTOSEL 5.10 05/16] fs/jfs: Add validity check for db_maxag and db

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Date:   Tue,  7 Nov 2023 10:52:24 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Juntong Deng <juntong.deng@...look.com>,
        syzbot+38e876a8aa44b7115c76@...kaller.appspotmail.com,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Sasha Levin <sashal@...nel.org>, shaggy@...nel.org,
        andrew.kanner@...il.com, wonguk.lee1023@...il.com,
        liushixin2@...wei.com, jfs-discussion@...ts.sourceforge.net,
        yogi.kernel@...il.com, ghandatmanas@...il.com, code@...dh.me
Subject: [PATCH AUTOSEL 5.10 05/16] fs/jfs: Add validity check for db_maxag and db_agpref

From: Juntong Deng <juntong.deng@...look.com>

[ Upstream commit 64933ab7b04881c6c18b21ff206c12278341c72e ]

Both db_maxag and db_agpref are used as the index of the
db_agfree array, but there is currently no validity check for
db_maxag and db_agpref, which can lead to errors.

The following is related bug reported by Syzbot:

UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:639:20
index 7936 is out of range for type 'atomic_t[128]'

Add checking that the values of db_maxag and db_agpref are valid
indexes for the db_agfree array.

Reported-by: syzbot+38e876a8aa44b7115c76@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=38e876a8aa44b7115c76
Signed-off-by: Juntong Deng <juntong.deng@...look.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jfs/jfs_dmap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index 06dda2c7a6e24..2ccb52371ceb5 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -195,6 +195,12 @@ int dbMount(struct inode *ipbmap)
 	bmp->db_maxlevel = le32_to_cpu(dbmp_le->dn_maxlevel);
 	bmp->db_maxag = le32_to_cpu(dbmp_le->dn_maxag);
 	bmp->db_agpref = le32_to_cpu(dbmp_le->dn_agpref);
+	if (bmp->db_maxag >= MAXAG || bmp->db_maxag < 0 ||
+		bmp->db_agpref >= MAXAG || bmp->db_agpref < 0) {
+		err = -EINVAL;
+		goto err_release_metapage;
+	}
+
 	bmp->db_aglevel = le32_to_cpu(dbmp_le->dn_aglevel);
 	bmp->db_agheight = le32_to_cpu(dbmp_le->dn_agheight);
 	bmp->db_agwidth = le32_to_cpu(dbmp_le->dn_agwidth);
-- 
2.42.0