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Merge branch 'bugfix/mdns_txt_alloc_issue_v4.4' into 'release/v4.4'

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mdns: Fix alloc issue if TXT has empty value(Backport v4.4)

See merge request espressif/esp-idf!16889
This commit is contained in:
David Čermák
2022-01-25 06:33:54 +00:00
parent 0b46ac1732 b3f913a058
commit c899c1b1da
1 changed files with 2 additions and 2 deletions
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4
components/mdns/mdns.c
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@ -702,8 +702,8 @@ static uint16_t _mdns_append_txt_record(uint8_t * packet, uint16_t * index, mdns
char * tmp; char * tmp;
mdns_txt_linked_item_t * txt = service->txt; mdns_txt_linked_item_t * txt = service->txt;
while (txt) { while (txt) {
uint8_t txt_data_len = strlen(txt->key) + txt->value_len + 1; uint8_t txt_data_len = strlen(txt->key) + txt->value_len + 1 /* + '=' char */;
tmp = (char *)malloc(txt_data_len); tmp = (char *)malloc(txt_data_len + 1 /* + '\0' term-char in sprintf() */);
if (tmp) { if (tmp) {
int offset = sprintf(tmp, "%s=", txt->key); int offset = sprintf(tmp, "%s=", txt->key);
memcpy(tmp + offset, txt->value, txt->value_len); memcpy(tmp + offset, txt->value, txt->value_len);