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net: lwm2m: Fix how payload offset is calculated

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Instead of manually computing payload offset, let the CoAP library do
the work, and use the payload pointer returned by the
`coap_packet_get_payload()` function instead.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2021-07-06 15:03:56 +02:00 • committed by Maureen Helm
commit b369156e28
3 changed files with 11 additions and 5 deletions
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9
subsys/net/lib/lwm2m/lwm2m_engine.c
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@ -3653,6 +3653,7 @@ static int handle_request(struct coap_packet *request,
uint16_t payload_len = 0U;
bool last_block = false;
bool ignore = false;
const uint8_t *payload_start;
/* set CoAP request / message */
msg->in.in_cpkt = request;
@ -3823,8 +3824,12 @@ static int handle_request(struct coap_packet *request,
}
/* setup incoming data */
msg->in.offset = msg->in.in_cpkt->hdr_len + msg->in.in_cpkt->opt_len;
coap_packet_get_payload(msg->in.in_cpkt, &payload_len);
payload_start = coap_packet_get_payload(msg->in.in_cpkt, &payload_len);
if (payload_len > 0) {
msg->in.offset = payload_start - msg->in.in_cpkt->data;
} else {
msg->in.offset = msg->in.in_cpkt->offset;
}
/* Check for block transfer */