netdev - [PATCH] Bluetooth: hci_sock: fix slab oob read in create_monitor

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Date: Tue, 10 Oct 2023 13:36:57 +0800
From: Edward AD <twuufnxlz@...il.com>
To: syzbot+c90849c50ed209d77689@...kaller.appspotmail.com
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	johan.hedberg@...il.com,
	kuba@...nel.org,
	linux-bluetooth@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	luiz.dentz@...il.com,
	luiz.von.dentz@...el.com,
	marcel@...tmann.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] Bluetooth: hci_sock: fix slab oob read in create_monitor_event

When accessing hdev->name, the actual string length should prevail

Reported-by: syzbot+c90849c50ed209d77689@...kaller.appspotmail.com
Fixes: dcda165706b9 ("Bluetooth: hci_core: Fix build warnings")
Signed-off-by: Edward AD <twuufnxlz@...il.com>
---
 net/bluetooth/hci_sock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index 5e4f718073b7..72abe54c45dd 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -488,7 +488,7 @@ static struct sk_buff *create_monitor_event(struct hci_dev *hdev, int event)
 		ni->type = hdev->dev_type;
 		ni->bus = hdev->bus;
 		bacpy(&ni->bdaddr, &hdev->bdaddr);
-		memcpy(ni->name, hdev->name, 8);
+		memcpy(ni->name, hdev->name, strlen(hdev->name));
 
 		opcode = cpu_to_le16(HCI_MON_NEW_INDEX);
 		break;
-- 
2.25.1