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[lwip-devel] [bug #57526] Fix the dns entries pcb_idx range

From: Konstantin
Subject: [lwip-devel] [bug #57526] Fix the dns entries pcb_idx range
Date: Fri, 3 Jan 2020 06:44:54 -0500 (EST)
User-agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0


                 Summary: Fix the dns entries pcb_idx range
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: tomcat_84
            Submitted on: Fri 03 Jan 2020 11:44:52 AM UTC
                Category: DNS
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.1.1



in dns_send(), when 


condition is met, pcb_idx is taken from the dns_table entry.

This pcb_idx probably can be equal to DNS_TABLE_SIZE, being set so elsewhere.
It is not tested inside dns_send(). It can cause table reading out of range.


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