linux-kernel - [PATCH] jfs: Add check for array bounds in dtDelete

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Message-Id: <20250918210414.15022-1-pedrodemargomes@gmail.com>
Date: Thu, 18 Sep 2025 18:04:14 -0300
From: Pedro Demarchi Gomes <pedrodemargomes@...il.com>
To: syzbot+4f9c823a6f63d87491ba@...kaller.appspotmail.com
Cc: jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com,
	Pedro Demarchi Gomes <pedrodemargomes@...il.com>
Subject: [PATCH] jfs: Add check for array bounds in dtDelete

#syz test

---
 fs/jfs/jfs_dtree.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/jfs/jfs_dtree.c b/fs/jfs/jfs_dtree.c
index ab11849cf9cc..b30f57304c09 100644
--- a/fs/jfs/jfs_dtree.c
+++ b/fs/jfs/jfs_dtree.c
@@ -2129,6 +2129,14 @@ int dtDelete(tid_t tid,
 					next_index = -1;
 				else {
 					stbl = DT_GETSTBL(np);
+					if (stbl[0] < 0 || stbl[0] >= DTPAGEMAXSLOT) {
+						jfs_err("JFS: Invalid stbl[0] = %d for inode %ld, block = %lld",
+							stbl[0], (long)ip->i_ino, (long long)le64_to_cpu(p->header.next));
+						DT_PUTPAGE(nmp);
+						DT_PUTPAGE(mp);
+						return -EIO;
+					}
+
 					ldtentry =
 					    (struct ldtentry *) & np->
 					    slot[stbl[0]];
-- 
2.39.5