linux-kernel - [PATCH AUTOSEL 4.19 14/21] jfs: fix shift-out-of-bounds in dbSplit

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Message-ID: <20241124135709.3351371-14-sashal@kernel.org>
Date: Sun, 24 Nov 2024 08:56:47 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ghanshyam Agrawal <ghanshyam1898@...il.com>,
	syzbot+b5ca8a249162c4b9a7d0@...kaller.appspotmail.com,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	shaggy@...nel.org,
	rbrasga@....edu,
	niharchaithanya@...il.com,
	aha310510@...il.com,
	peili.dev@...il.com,
	eadavis@...com,
	jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 4.19 14/21] jfs: fix shift-out-of-bounds in dbSplit

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

[ Upstream commit a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d ]

When dmt_budmin is less than zero, it causes errors
in the later stages. Added a check to return an error beforehand
in dbAllocCtl itself.

Reported-by: syzbot+b5ca8a249162c4b9a7d0@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b5ca8a249162c4b9a7d0
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_dmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index b6c698fe7301d..7bb2d0212c90a 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -1899,6 +1899,9 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results)
 			return -EIO;
 		dp = (struct dmap *) mp->data;
 
+		if (dp->tree.budmin < 0)
+			return -EIO;
+
 		/* try to allocate the blocks.
 		 */
 		rc = dbAllocDmapLev(bmp, dp, (int) nblocks, l2nb, results);
-- 
2.43.0