Bluetooth: A2MP: Fix potential NULL dereference

Return INVALID_CTRL_ID for unknown AMP controller and for BR/EDR
controller and fixes dereference possible NULL pointer.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

1 files changed, 8 insertions, 6 deletions

diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 42788cdbb4fe..d4946b591b71 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -278,7 +278,7 @@ static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
         BT_DBG("id %d", req->id);
 
         hdev = hci_dev_get(req->id);
-        if (!hdev) {
+        if (!hdev || hdev->dev_type != HCI_AMP) {
                 struct a2mp_info_rsp rsp;
 
                 rsp.id = req->id;
@@ -286,14 +286,16 @@ static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
 
                 a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
                           &rsp);
-        }
 
-        if (hdev->dev_type != HCI_BREDR) {
-                mgr->state = READ_LOC_AMP_INFO;
-                hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
+                goto done;
         }
 
-        hci_dev_put(hdev);
+        mgr->state = READ_LOC_AMP_INFO;
+        hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
+
+done:
+        if (hdev)
+                hci_dev_put(hdev);
 
         skb_pull(skb, sizeof(*req));
         return 0;