linux-kernel - Re: [syzbot] [hfs?] KASAN: out-of-bounds Read in hfs_bnode

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Message-ID: <tencent_D1B2A5C90DBB9238DDD65DF11919CFA60D07@qq.com>
Date: Thu, 24 Jul 2025 19:46:41 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+41ba9c82bce8d7101765@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hfs?] KASAN: out-of-bounds Read in hfs_bnode_move

#syz test

diff --git a/fs/hfs/bfind.c b/fs/hfs/bfind.c
index ef9498a6e88a..1d6f2bbafa7a 100644
--- a/fs/hfs/bfind.c
+++ b/fs/hfs/bfind.c
@@ -133,6 +133,8 @@ int hfs_brec_find(struct hfs_find_data *fd)
 			goto invalid;
 		if (bnode->type != (--height ? HFS_NODE_INDEX : HFS_NODE_LEAF))
 			goto invalid;
+		if (!bnode->num_recs)
+			goto invalid;
 		bnode->parent = parent;
 
 		res = __hfs_brec_find(bnode, fd);