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Bluetooth: fix null ptr deref on hci_sync_conn_complete_evt 

[ Upstream commit 3afee21181 ]

This event is just specified for SCO and eSCO link types.
On the reception of a HCI_Synchronous_Connection_Complete for a BDADDR
of an existing LE connection, LE link type and a status that triggers the
second case of the packet processing a NULL pointer dereference happens,
as conn->link is NULL.

Signed-off-by: Soenke Huster <soenke.huster@eknoes.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Soenke Huster 2022-01-14 17:44:02 +01:00 committed by Greg Kroah-Hartman
parent cbd96d6cad
commit f61c23e73d
1 changed files with 13 additions and 0 deletions
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13
net/bluetooth/hci_event.c
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@ -4661,6 +4661,19 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev, void *data,
struct hci_ev_sync_conn_complete *ev = data;
struct hci_conn *conn;
switch (ev->link_type) {
case SCO_LINK:
case ESCO_LINK:
break;
default:
/* As per Core 5.3 Vol 4 Part E 7.7.35 (p.2219), Link_Type
* for HCI_Synchronous_Connection_Complete is limited to
* either SCO or eSCO
*/
bt_dev_err(hdev, "Ignoring connect complete event for invalid link type");
return;
}
bt_dev_dbg(hdev, "status 0x%2.2x", ev->status);
hci_dev_lock(hdev);