linux-kernel - Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbJoin (2)

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Message-ID: <tencent_41836E496D83A2444DD76B176626D4337505@qq.com>
Date: Sun,  7 Dec 2025 11:18:43 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+fa603ae6b02658401ca7@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbJoin (2)

#syz test

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index cdfa699cd7c8..7c35e69cafb9 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -2291,6 +2291,8 @@ static int dbFreeBits(struct bmap * bmp, struct dmap * dp, s64 blkno,
 	int rc = 0;
 	int size;
 
+	if (tp->dmt_budmin < 0)
+		return -EUCLEAN;
 	/* determine the bit number and word within the dmap of the
 	 * starting block.
 	 */