linux-kernel - [PATCH AUTOSEL 5.4 16/28] jfs: array-index-out-of-bounds fix in dtReadFirst

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Message-ID: <20241124135549.3350700-16-sashal@kernel.org>
Date: Sun, 24 Nov 2024 08:55:16 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ghanshyam Agrawal <ghanshyam1898@...il.com>,
	syzbot+65fa06e29859e41a83f3@...kaller.appspotmail.com,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	shaggy@...nel.org,
	eadavis@...com,
	jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 5.4 16/28] jfs: array-index-out-of-bounds fix in dtReadFirst

From: Ghanshyam Agrawal <ghanshyam1898@...il.com>

[ Upstream commit ca84a2c9be482836b86d780244f0357e5a778c46 ]

The value of stbl can be sometimes out of bounds due
to a bad filesystem. Added a check with appopriate return
of error code in that case.

Reported-by: syzbot+65fa06e29859e41a83f3@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=65fa06e29859e41a83f3
Signed-off-by: Ghanshyam Agrawal <ghanshyam1898@...il.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jfs/jfs_dtree.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index 077a87e530205..bd198b04c388f 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -3382,6 +3382,13 @@ static int dtReadFirst(struct inode *ip, struct btstack * btstack)
 
 		/* get the leftmost entry */
 		stbl = DT_GETSTBL(p);
+
+		if (stbl[0] < 0 || stbl[0] > 127) {
+			DT_PUTPAGE(mp);
+			jfs_error(ip->i_sb, "stbl[0] out of bound\n");
+			return -EIO;
+		}
+
 		xd = (pxd_t *) & p->slot[stbl[0]];
 
 		/* get the child page block address */
-- 
2.43.0