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mdns: fix memory free issue when repeating the query in reply

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The repeated query will be copied in the next event loop while the
memory is freed instantly. Delay the free to fix this issue.
This commit is contained in:
Jiacheng Guo 2021-04-16 15:19:34 +08:00
parent 2aa48c9558
commit 5f244c86f2
2 changed files with 47 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
components/mdns/mdns.c
View File

@ -1057,7 +1057,26 @@ static void _mdns_free_tx_packet(mdns_tx_packet_t * packet)
if (!packet) {
return;
}
queueFree(mdns_out_question_t, packet->questions);
mdns_out_question_t *q = packet->questions;
while (q) {
mdns_out_question_t *next = q->next;
if (q->own_dynamic_memory) {
if (q->host) {
free((char *)q->host);
}
if (q->service) {
free((char *)q->service);
}
if (q->proto) {
free((char *)q->proto);
}
if (q->domain) {
free((char *)q->domain);
}
}
free(q);
q = next;
}
queueFree(mdns_out_answer_t, packet->answers);
queueFree(mdns_out_answer_t, packet->servers);
queueFree(mdns_out_answer_t, packet->additional);
@ -1341,8 +1360,18 @@ static void _mdns_create_answer_from_parsed_packet(mdns_parsed_packet_t * parsed
_mdns_free_tx_packet(packet);
return;
}
memcpy(out_question, q, sizeof(mdns_out_question_t));
out_question->type = q->type;
out_question->unicast = q->unicast;
out_question->host = q->host;
q->host = NULL;
out_question->service = q->service;
q->service = NULL;
out_question->proto = q->proto;
q->proto = NULL;
out_question->domain = q->domain;
q->domain = NULL;
out_question->next = NULL;
out_question->own_dynamic_memory = true;
queueToEnd(mdns_out_question_t, packet->questions, out_question);
#endif // MDNS_REPEAT_QUERY_IN_RESPONSE
} else if (!_mdns_alloc_answer(&packet->answers, q->type, NULL, send_flush, false)) {
@ -1409,6 +1438,7 @@ static mdns_tx_packet_t * _mdns_create_probe_packet(mdns_if_t tcpip_if, mdns_ip_
q->service = services[i]->service->service;
q->proto = services[i]->service->proto;
q->domain = MDNS_DEFAULT_DOMAIN;
q->own_dynamic_memory = false;
if (!q->host || _mdns_question_exists(q, packet->questions)) {
free(q);
continue;
@ -1436,6 +1466,7 @@ static mdns_tx_packet_t * _mdns_create_probe_packet(mdns_if_t tcpip_if, mdns_ip_
q->service = NULL;
q->proto = NULL;
q->domain = MDNS_DEFAULT_DOMAIN;
q->own_dynamic_memory = false;
if (_mdns_question_exists(q, packet->questions)) {
free(q);
} else {
@ -3117,10 +3148,18 @@ clear_rx_packet:
while (parsed_packet->questions) {
mdns_parsed_question_t * question = parsed_packet->questions;
parsed_packet->questions = parsed_packet->questions->next;
free(question->host);
free(question->service);
free(question->proto);
free(question->domain);
if (question->host) {
free(question->host);
}
if (question->service) {
free(question->service);
}
if (question->proto) {
free(question->proto);
}
if (question->domain) {
free(question->domain);
}
free(question);
}
free(parsed_packet);
@ -3650,6 +3689,7 @@ static mdns_tx_packet_t * _mdns_create_search_packet(mdns_search_once_t * search
q->service = search->service;
q->proto = search->proto;
q->domain = MDNS_DEFAULT_DOMAIN;
q->own_dynamic_memory = false;
queueToEnd(mdns_out_question_t, packet->questions, q);
if (search->type == MDNS_TYPE_PTR) {

1
components/mdns/private_include/mdns_private.h
View File

@ -299,6 +299,7 @@ typedef struct mdns_out_question_s {
const char * service;
const char * proto;
const char * domain;
bool own_dynamic_memory;
} mdns_out_question_t;
typedef struct mdns_out_answer_s {