linux-kernel - [PATCH] jfs: test syz test

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Message-Id: <d5067a639f2341e6cce0a48f810c22d2e36c33a8.1760688719.git.xiaopei01@kylinos.cn>
Date: Fri, 17 Oct 2025 16:13:55 +0800
From: Pei Xiao <xiaopei01@...inos.cn>
To: syzbot+4b717071f1eecb2972df@...kaller.appspotmail.com
Cc: jfs-discussion@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	shaggy@...nel.org,
	syzkaller-bugs@...glegroups.com,
	Pei Xiao <xiaopei01@...inos.cn>
Subject: [PATCH] jfs: test syz test

diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index cdfa699cd7c8..9d26c5dc4efd 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -1435,6 +1435,11 @@ dbAllocAG(struct bmap * bmp, int agno, s64 nblocks, int l2nb, s64 * results)
 			blkno &= ~(MAXL1SIZE - 1);
 		else		/* bmp->db_aglevel == 0 */
 			blkno &= ~(MAXL0SIZE - 1);
+		
+		if (unlikely(budmin < 0)) {
+   			WARN_ON_ONCE(1);
+    			budmin = 0;
+		}		
 
 		blkno +=
 		    ((s64) (ti - le32_to_cpu(dcp->leafidx))) << budmin;
-- 
2.25.1