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mqtt: slightly change some overflow checks

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This commit is contained in:
goldsimon 2018-02-14 12:37:35 +01:00
parent eea95459c9
commit 133bf70ab5
1 changed files with 14 additions and 12 deletions
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26
src/apps/mqtt/mqtt.c
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@ -277,18 +277,19 @@ mqtt_output_send(struct mqtt_ringbuf_t *rb, struct altcp_pcb *tpcb)
/**
* Create request item
* @param r_objs Pointer to request objects
* @param r_objs_len Number of array entries
* @param pkt_id Packet identifier of request
* @param cb Packet callback to call when requests lifetime ends
* @param arg Parameter following callback
* @return Request or NULL if failed to create
*/
static struct mqtt_request_t *
mqtt_create_request(struct mqtt_request_t *r_objs, u16_t pkt_id, mqtt_request_cb_t cb, void *arg)
mqtt_create_request(struct mqtt_request_t *r_objs, size_t r_objs_len, u16_t pkt_id, mqtt_request_cb_t cb, void *arg)
{
struct mqtt_request_t *r = NULL;
u8_t n;
LWIP_ASSERT("mqtt_create_request: r_objs != NULL", r_objs != NULL);
for (n = 0; n < MQTT_REQ_MAX_IN_FLIGHT; n++) {
for (n = 0; n < r_objs_len; n++) {
/* Item point to itself if not in use */
if (r_objs[n].next == &r_objs[n]) {
r = &r_objs[n];
@ -429,13 +430,14 @@ mqtt_clear_requests(struct mqtt_request_t **tail)
/**
* Initialize all request items
* @param r_objs Pointer to request objects
* @param r_objs_len Number of array entries
*/
static void
mqtt_init_requests(struct mqtt_request_t *r_objs)
mqtt_init_requests(struct mqtt_request_t *r_objs, size_t r_objs_len)
{
u8_t n;
LWIP_ASSERT("mqtt_init_requests: r_objs != NULL", r_objs != NULL);
for (n = 0; n < MQTT_REQ_MAX_IN_FLIGHT; n++) {
for (n = 0; n < r_objs_len; n++) {
/* Item pointing to itself indicates unused */
r_objs[n].next = &r_objs[n];
}
@ -1110,21 +1112,21 @@ mqtt_publish(mqtt_client_t *client, const char *topic, const void *payload, u16_
LWIP_ERROR("mqtt_publish: topic length overflow", (topic_strlen <= (0xFFFF - 2)), return ERR_ARG);
topic_len = (u16_t)topic_strlen;
total_len = 2 + topic_len + payload_length;
LWIP_ERROR("mqtt_publish: total length overflow", (total_len <= 0xFFFF), return ERR_ARG);
remaining_length = (u16_t)total_len;
LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_publish: Publish with payload length %d to topic \"%s\"\n", payload_length, topic));
if (qos > 0) {
remaining_length += 2;
total_len += 2;
/* Generate pkt_id id for QoS1 and 2 */
pkt_id = msg_generate_packet_id(client);
} else {
/* Use reserved value pkt_id 0 for QoS 0 in request handle */
pkt_id = 0;
}
LWIP_ERROR("mqtt_publish: total length overflow", (total_len <= 0xFFFF), return ERR_ARG);
remaining_length = (u16_t)total_len;
r = mqtt_create_request(client->req_list, pkt_id, cb, arg);
LWIP_DEBUGF(MQTT_DEBUG_TRACE, ("mqtt_publish: Publish with payload length %d to topic \"%s\"\n", payload_length, topic));
r = mqtt_create_request(client->req_list, LWIP_ARRAYSIZE(client->req_list), pkt_id, cb, arg);
if (r == NULL) {
return ERR_MEM;
}
@ -1195,7 +1197,7 @@ mqtt_sub_unsub(mqtt_client_t *client, const char *topic, u8_t qos, mqtt_request_
}
pkt_id = msg_generate_packet_id(client);
r = mqtt_create_request(client->req_list, pkt_id, cb, arg);
r = mqtt_create_request(client->req_list, LWIP_ARRAYSIZE(client->req_list), pkt_id, cb, arg);
if (r == NULL) {
return ERR_MEM;
}
@ -1304,7 +1306,7 @@ mqtt_client_connect(mqtt_client_t *client, const ip_addr_t *ip_addr, u16_t port,
client->connect_arg = arg;
client->connect_cb = cb;
client->keep_alive = client_info->keep_alive;
mqtt_init_requests(client->req_list);
mqtt_init_requests(client->req_list, LWIP_ARRAYSIZE(client->req_list));
/* Build connect message */
if (client_info->will_topic != NULL && client_info->will_msg != NULL) {