Bluetooth: MGMT: Fix memory leak in set_ssp_complete

Fix memory leak in set_ssp_complete() where mgmt_pending_cmd structures
are not freed after being removed from the pending list.

Commit 302a1f674c00 ("Bluetooth: MGMT: Fix possible UAFs") replaced
mgmt_pending_foreach() calls with individual command handling but missed
adding mgmt_pending_free() calls in both error and success paths of
set_ssp_complete(). Other completion functions like set_le_complete()
were fixed correctly in the same commit.

This causes a memory leak of the mgmt_pending_cmd structure and its
associated parameter data for each SSP command that completes.

Add the missing mgmt_pending_free(cmd) calls in both code paths to fix
the memory leak. Also fix the same issue in set_advertising_complete().

Fixes: 302a1f674c00 ("Bluetooth: MGMT: Fix possible UAFs")
Signed-off-by: Jianpeng Chang <[e-mail]>
Signed-off-by: Luiz Augusto von Dentz <[e-mail]>

net/bluetooth/mgmt.c

···
 		}
 
 		mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
+		mgmt_pending_free(cmd);
 		return;
 	}
 
···
 		sock_put(match.sk);
 
 	hci_update_eir_sync(hdev);
+	mgmt_pending_free(cmd);
 }
 
 static int set_ssp_sync(struct hci_dev *hdev, void *data)
···
 		hci_dev_clear_flag(hdev, HCI_ADVERTISING);
 
 	settings_rsp(cmd, &match);
+	mgmt_pending_free(cmd);
 
 	new_settings(hdev, match.sk);