linux-kernel - Re: [syzbot] [jfs?] WARNING: fs/jfs/jfs_dmap.c:LINE at dbAdjTree, CPU: jfsCommit/NUM

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Message-ID: <tencent_6BBB12330F9EEB1B9A4B791B262506BA6708@qq.com>
Date: Tue, 17 Jun 2025 11:01:50 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+077d9ebda84f426a6a1e@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] WARNING: fs/jfs/jfs_dmap.c:LINE at dbAdjTree, CPU: jfsCommit/NUM

#syz test

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index 35e063c9f3a4..7e3c5f6826d8 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -2856,9 +2856,13 @@ static int dbJoin(dmtree_t *tp, int leafno, int newval, bool is_ctl)
 static void dbAdjTree(dmtree_t *tp, int leafno, int newval, bool is_ctl)
 {
 	int lp, pp, k;
-	int max, size;
+	int max, size, max_idx;
 
 	size = is_ctl ? CTLTREESIZE : TREESIZE;
+	max_idx = is_ctl ? LPERCTL : LPERDMAP;
+
+	if (le32_to_cpu(tp->dmt_leafidx) >= max_idx)
+		return;
 
 	/* pick up the index of the leaf for this leafno.
 	 */