From 8c4cc1b8690db4acb034e433fc1f9704ac23aad9 Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Tue, 12 Dec 2023 16:15:45 +0100
Subject: [PATCH] l2cap: ignore signaling responses in closed state

---
 src/l2cap.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/l2cap.c b/src/l2cap.c
index 426810ed7..a564c077e 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -3766,8 +3766,19 @@ static void l2cap_signaling_handler_dispatch(hci_con_handle_t handle, uint8_t *
         }
     }
 
-    // send command reject
-    l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, 0, L2CAP_REJ_CMD_UNKNOWN);
+    // If dynamic channel cannot be found, either never set-up or already finalized, assume state CLOSED
+    // Handle events as described in Core 5.4, Vol 3. Host, 6.1.1 CLOSED state
+    switch (code){
+        case CONNECTION_RESPONSE:
+        case CONFIGURE_RESPONSE:
+        case DISCONNECTION_RESPONSE:
+            // Ignore request
+            break;
+        default:
+            // send command reject with reason unknown command
+            l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, 0, L2CAP_REJ_CMD_UNKNOWN);
+            break;
+    }
 }
 #endif