[lwip-devel] [bug #61590] DNS Servers Limit when DNS_MAX_SERVERS > LWIP_DHCP_MAX_DNS_SERVERS

[Corentin]

URL:
  <https://savannah.nongnu.org/bugs/?61590>

                 Summary: DNS Servers Limit when DNS_MAX_SERVERS >
LWIP_DHCP_MAX_DNS_SERVERS
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: corentin
            Submitted on: Tue 30 Nov 2021 03:59:58 PM UTC
                Category: DHCP
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

When DNS_MAX_SERVERS > LWIP_DHCP_MAX_DNS_SERVERS, the limit number of DNS
servers provided by decode_len in function dhcp_parse_reply is set by
DNS_MAX_SERVERS.

this generate an LWIP_ASSERT (decode_idx < DHCP_OPTION_IDX_MAX) when DHCP send
much than LWIP_DHCP_MAX_DNS_SERVERS. 

See watched a patch that sound fix this issue.





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File Attachments:


-------------------------------------------------------
Date: Tue 30 Nov 2021 03:59:58 PM UTC  Name: dhcp_dns.patch  Size: 709B   By:
corentin

<http://savannah.nongnu.org/bugs/download.php?file_id=52390>

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