NFC: Dot not dispatch HCI event received on unopened pipe

A chip with pre-opened gates may send events on a gate that nobody
has opened in the handset host. Discard those events.

Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
index a58db89b4555..38d5f96dfd10 100644
--- a/net/nfc/hci/core.c
+++ b/net/nfc/hci/core.c
@@ -286,6 +286,12 @@ void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
                             struct sk_buff *skb)
 {
         int r = 0;
+        u8 gate = nfc_hci_pipe2gate(hdev, pipe);
+
+        if (gate == 0xff) {
+                pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
+                goto exit;
+        }
 
         switch (event) {
         case NFC_HCI_EVT_TARGET_DISCOVERED:
@@ -309,14 +315,11 @@ void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
                         goto exit;
                 }
 
-                r = nfc_hci_target_discovered(hdev,
-                                              nfc_hci_pipe2gate(hdev, pipe));
+                r = nfc_hci_target_discovered(hdev, gate);
                 break;
         default:
                 if (hdev->ops->event_received) {
-                        hdev->ops->event_received(hdev,
-                                                nfc_hci_pipe2gate(hdev, pipe),
-                                                event, skb);
+                        hdev->ops->event_received(hdev, gate, event, skb);
                         return;
                 }