linux-kernel - [PATCH next] hfsplus: fix oob in hfsplus_bnode_read

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Message-ID: <tencent_164AB8743976ED67863C2F375496E236B009@qq.com>
Date: Sun,  4 Feb 2024 19:51:22 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+57028366b9825d8e8ad0@...kaller.appspotmail.com
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH next] hfsplus: fix oob in hfsplus_bnode_read_key

In hfs_brec_insert(), if data has not been moved to "data_off + size", the size
should not be added when reading search_key from node->page.

Reported-and-tested-by: syzbot+57028366b9825d8e8ad0@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 fs/hfsplus/brec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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