linux-kernel - [PATCH AUTOSEL 4.9 3/8] fs: jfs: fix shift-out-of-bounds in dbDiscardAG

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Message-Id: <20221217153053.99513-3-sashal@kernel.org>
Date:   Sat, 17 Dec 2022 10:30:47 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hoi Pok Wu <wuhoipok@...il.com>,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Sasha Levin <sashal@...nel.org>, shaggy@...nel.org,
        r33s3n6@...il.com, mudongliangabcd@...il.com, paskripkin@...il.com,
        jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 4.9 3/8] fs: jfs: fix shift-out-of-bounds in dbDiscardAG

From: Hoi Pok Wu <wuhoipok@...il.com>

[ Upstream commit 25e70c6162f207828dd405b432d8f2a98dbf7082 ]

This should be applied to most URSAN bugs found recently by syzbot,
by guarding the dbMount. As syzbot feeding rubbish into the bmap
descriptor.

Signed-off-by: Hoi Pok Wu <wuhoipok@...il.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jfs/jfs_dmap.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index a46fa0f3db57..0ca1ad2610df 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -211,6 +211,11 @@ int dbMount(struct inode *ipbmap)
 		goto err_release_metapage;
 	}
 
+	if (((bmp->db_mapsize - 1) >> bmp->db_agl2size) > MAXAG) {
+		err = -EINVAL;
+		goto err_release_metapage;
+	}
+
 	for (i = 0; i < MAXAG; i++)
 		bmp->db_agfree[i] = le64_to_cpu(dbmp_le->dn_agfree[i]);
 	bmp->db_agsize = le64_to_cpu(dbmp_le->dn_agsize);
-- 
2.35.1