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Commit 5dcdae78 authored by Chris Manton's avatar Chris Manton
Browse files

Check for valid ACL disconnect reason 

Bug: 297211196
Test: atest net_test_stack_btm

Change-Id: I18e987eb64a01421bc502c5e07d3b99e15538b15
parent a64a1d76

system/stack/acl/btm_acl.cc

+29 −0
Original line number Diff line number Diff line
@@ -2708,8 +2708,37 @@ void acl_disconnect_from_handle(uint16_t handle, tHCI_STATUS reason, 
  acl_disconnect_after_role_switch(handle, reason, comment);

}



// BLUETOOTH CORE SPECIFICATION Version 5.4 | Vol 4, Part E

// 7.1.6 Disconnect command

// Only a subset of reasons are valid and will be accepted

// by the controller

bool is_disconnect_reason_valid(const tHCI_REASON& reason) {

  switch (reason) {

    case HCI_ERR_AUTH_FAILURE:

    case HCI_ERR_PEER_USER:

    case HCI_ERR_REMOTE_LOW_RESOURCE:

    case HCI_ERR_REMOTE_POWER_OFF:

    case HCI_ERR_UNSUPPORTED_REM_FEATURE:

    case HCI_ERR_PAIRING_WITH_UNIT_KEY_NOT_SUPPORTED:

    case HCI_ERR_UNACCEPT_CONN_INTERVAL:

      return true;

    default:

      break;

  }

  return false;

}



void acl_disconnect_after_role_switch(uint16_t conn_handle, tHCI_STATUS reason,

                                      std::string comment) {

  if (!is_disconnect_reason_valid(reason)) {

    LOG_WARN(

        "Controller will not accept invalid reason parameter:%s"

        " instead sending:%s",

        hci_error_code_text(reason).c_str(),

        hci_error_code_text(HCI_ERR_PEER_USER).c_str());

    reason = HCI_ERR_PEER_USER;

  }



  tACL_CONN* p_acl = internal_.acl_get_connection_from_handle(conn_handle);

  if (p_acl == nullptr) {

    LOG_ERROR("Sending disconnect for unknown acl:%hu PLEASE FIX", conn_handle);

system/stack/test/btm/stack_btm_test.cc

+20 −0
Original line number Diff line number Diff line
@@ -493,3 +493,23 @@ TEST_F(StackBtmWithInitFreeTest, wipe_secrets_and_remove) { 


  wipe_secrets_and_remove(device_record);

}



bool is_disconnect_reason_valid(const tHCI_REASON& reason);

TEST_F(StackBtmWithInitFreeTest, is_disconnect_reason_valid) {

  std::set<tHCI_REASON> valid_reason_set{

      HCI_ERR_AUTH_FAILURE,

      HCI_ERR_PEER_USER,

      HCI_ERR_REMOTE_LOW_RESOURCE,

      HCI_ERR_REMOTE_POWER_OFF,

      HCI_ERR_UNSUPPORTED_REM_FEATURE,

      HCI_ERR_PAIRING_WITH_UNIT_KEY_NOT_SUPPORTED,

      HCI_ERR_UNACCEPT_CONN_INTERVAL,

  };

  for (unsigned u = 0; u < 256; u++) {

    const tHCI_REASON reason = static_cast<tHCI_REASON>(u);

    if (valid_reason_set.count(reason))

      ASSERT_TRUE(is_disconnect_reason_valid(reason));

    else

      ASSERT_FALSE(is_disconnect_reason_valid(reason));

  }

}