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coap_net.c: Set remote CSM Max Message Size to local max if bigger

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Prevent remote endpoint from setting Max Message Size to be larger
than the local endpoint can handle.
This commit is contained in:
Jon Shallow authored and Jon Shallow committed 2025-06-20 16:10:15 +01:00
1 parent 1b790ea800
commit 7889db616a
2 files changed
+10 -3
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src/coap_net.c
+8 -2
View File
@@ -4257,8 +4257,14 @@ handle_signaling(coap_context_t *context, coap_session_t *session,
}
while ((option = coap_option_next(&opt_iter))) {
if (opt_iter.number == COAP_SIGNALING_OPTION_MAX_MESSAGE_SIZE) {
coap_session_set_mtu(session, coap_decode_var_bytes(coap_opt_value(option),
coap_opt_length(option)));
unsigned max_recv = coap_decode_var_bytes(coap_opt_value(option), coap_opt_length(option));
if (max_recv > context->csm_max_message_size) {
max_recv = context->csm_max_message_size;
coap_log_debug("* %s: Setting size to %u\n",
coap_session_str(session), max_recv);
}
coap_session_set_mtu(session, max_recv);
set_mtu = 1;
} else if (opt_iter.number == COAP_SIGNALING_OPTION_BLOCK_WISE_TRANSFER) {
session->csm_block_supported = 1;
src/coap_pdu.c
+2 -1
View File
@@ -175,7 +175,8 @@ coap_new_pdu_lkd(coap_pdu_type_t type, coap_pdu_code_t code,
pdu = coap_pdu_init(type, code, coap_new_message_id_lkd(session),
coap_session_max_pdu_size_lkd(session));
if (!pdu)
coap_log_crit("coap_new_pdu: cannot allocate memory for new PDU\n");
coap_log_crit("coap_new_pdu: cannot allocate memory for new PDU (size = %zu)\n",
coap_session_max_pdu_size_lkd(session));
return pdu;
}