Bluetooth: Fix null pointer dereference in hci_event_packet()
[ Upstream commit5.4-rM2-2.2.x-imx-squashed6dfccd13db
] AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon. - net/bluetooth/hci_event.c:4945 The bug seems to get triggered in this line: bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon; Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status. Fixes:d5e911928b
("Bluetooth: AMP: Process Physical Link Complete evt") Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f Signed-off-by: Anmol Karn <anmol.karan123@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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d92b81fad0
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5cf3c2e789
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@ -4791,6 +4791,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
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return;
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}
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if (!hcon->amp_mgr) {
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hci_dev_unlock(hdev);
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return;
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}
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if (ev->status) {
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hci_conn_del(hcon);
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hci_dev_unlock(hdev);
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