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l2cap: check cmd len before reading dest_cid in classic signaling handler

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This commit is contained in:
Matthias Ringwald 2023-12-12 17:21:52 +01:00
parent 1f0786fdf5
commit 977cd8e3de
1 changed files with 31 additions and 25 deletions
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56
src/l2cap.c
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@ -3747,26 +3747,28 @@ static void l2cap_signaling_handler_dispatch(hci_con_handle_t handle, uint8_t *
break;
}
// Get potential destination CID
uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET);
// Find channel for this sig_id and connection handle
btstack_linked_list_iterator_init(&it, &l2cap_channels);
while (btstack_linked_list_iterator_has_next(&it)){
l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it);
if (!l2cap_is_dynamic_channel_type(channel->channel_type)) continue;
if (channel->con_handle != handle) continue;
if (code & 1) {
// match odd commands (responses) by previous signaling identifier
if (channel->local_sig_id == sig_id) {
l2cap_signaling_handler_channel(channel, command);
return;
}
} else {
// match even commands (requests) by local channel id
if (channel->local_cid == dest_cid) {
l2cap_signaling_handler_channel(channel, command);
return;
if (cmd_len >= 2){
// Get potential destination CID
uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET);
// Find channel for this sig_id and connection handle
btstack_linked_list_iterator_init(&it, &l2cap_channels);
while (btstack_linked_list_iterator_has_next(&it)){
l2cap_channel_t * channel = (l2cap_channel_t *) btstack_linked_list_iterator_next(&it);
if (!l2cap_is_dynamic_channel_type(channel->channel_type)) continue;
if (channel->con_handle != handle) continue;
if (code & 1) {
// match odd commands (responses) by previous signaling identifier
if (channel->local_sig_id == sig_id) {
l2cap_signaling_handler_channel(channel, command);
return;
}
} else {
// match even commands (requests) by local channel id
if (channel->local_cid == dest_cid) {
l2cap_signaling_handler_channel(channel, command);
return;
}
}
}
}
@ -3778,16 +3780,20 @@ static void l2cap_signaling_handler_dispatch(hci_con_handle_t handle, uint8_t *
case CONFIGURE_RESPONSE:
case DISCONNECTION_RESPONSE:
// Ignore request
break;
return;
case CONFIGURE_REQUEST:
// send command reject with reason invalid cid
l2cap_register_signaling_response(handle, CONFIGURE_REQUEST, sig_id, dest_cid, L2CAP_REJ_INVALID_CID);
if (cmd_len >= 2){
uint16_t dest_cid = little_endian_read_16(command, L2CAP_SIGNALING_COMMAND_DATA_OFFSET);
// send command reject with reason invalid cid
l2cap_register_signaling_response(handle, CONFIGURE_REQUEST, sig_id, dest_cid, L2CAP_REJ_INVALID_CID);
return;
}
break;
default:
// send command reject with reason unknown command
l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, 0, L2CAP_REJ_CMD_UNKNOWN);
break;
}
// otherwise send command reject with reason unknown command
l2cap_register_signaling_response(handle, COMMAND_REJECT, sig_id, 0, L2CAP_REJ_CMD_UNKNOWN);
}
#endif