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Date:   Sun, 16 Aug 2020 16:13:49 +0800
From:   Fox Chen <>
To:     Marcel Holtmann <>,
        Johan Hedberg <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,,,, Greg KH <>
Subject: HCI_EV_PHY_LINK_COMPLETE in net/bluetooth/hci_event.c

Dear all,

I have a question about

static void hci_phy_link_complete_evt(struct hci_dev *hdev,
struct sk_buff *skb)
-- HCI_EV_PHY_LINK_COMPLETE event packet handler in hci_even.c:4940

if (ev->status) {
        hci_conn_del(hcon);                 <--------------

Is it correct to del hcon here?? Because later on, when we close the
socket fd, socket_close will call sco_chan_del which will eventually
call hci_conn_drop. With hcon already deleted by this handler, it will

This bug is reported by syzbot in

I'm trying to fix that, but I don't know the design nature of
HCI_EV_PHY_LINK_COMPLETE. Will this scenario happen in real life?? Can
I remove hci_conn_del(hcon) here (I tested it, which fixes this bug)


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