Bug in DNS server: Incorrect array indexing when checking IP address (IDFGH-16653)

[jojo2massol]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

esp-idf/examples/protocols/http_server/captive_portal/components/dns_server/dns_server.c

Line 161 in ab14938

} else if (h->entry->ip.addr != IPADDR_ANY) {

The DNS server does not use the correct entry index when checking the IP address.

h->entry->ip.addr 

instead of

h->entry[i].ip.addr

which causes it to always check entry 0 regardless of which entry matched in the loop.

This bug prevents proper DNS resolution when multiple entries are configured and the matching entry is not at index 0.