linux-kernel - Re: [syzbot] [hfs?] KASAN: slab-out-of-bounds Write in hfsplus_bnode_read

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Message-ID: <tencent_562545BA71BB31330B9E161B694BE61B5308@qq.com>
Date: Sun,  4 Feb 2024 19:04:23 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+57028366b9825d8e8ad0@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hfs?] KASAN: slab-out-of-bounds Write in hfsplus_bnode_read_key

please test oob in hfsplus_bnode_read_key

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master 

diff --git a/fs/hfsplus/brec.c b/fs/hfsplus/brec.c
index 1918544a7871..9e0e0c1f15a5 100644
--- a/fs/hfsplus/brec.c
+++ b/fs/hfsplus/brec.c
@@ -138,7 +138,8 @@ int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len)
 	 * at the start of the node and it is not the new node
 	 */
 	if (!rec && new_node != node) {
-		hfs_bnode_read_key(node, fd->search_key, data_off + size);
+		hfs_bnode_read_key(node, fd->search_key, data_off + 
+				(idx_rec_off == data_rec_off ? 0 : size));
 		hfs_brec_update_parent(fd);
 	}
 
-- 
2.43.0