[Bro-Dev] [JIRA] (BIT-1298) IP_Hdr pointer do not propagate from udp to child analyzers via DeliverPacket method causing a segfault

[Eric Asselin (JIRA)]

    [ https://bro-tracker.atlassian.net/browse/BIT-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19206#comment-19206 ] 

Eric Asselin commented on BIT-1298:
-----------------------------------

The error happens when the analyzer is enabled with signature like this :

signature my_ntp_test {
    ip-proto == udp
    src-port == 123                                                                
    enable "ntp"
    }

But the error doesn't happen when enabled from a Bro script like this :

local ports = set(123/udp);
Analyzer::register_for_ports(Analyzer::ANALYZER_NTP, ports);



> IP_Hdr pointer do not propagate from udp to child analyzers via DeliverPacket method causing a segfault
> -------------------------------------------------------------------------------------------------------
>
>                 Key: BIT-1298
>                 URL: https://bro-tracker.atlassian.net/browse/BIT-1298
>             Project: Bro Issue Tracker
>          Issue Type: Problem
>          Components: Bro
>    Affects Versions: 2.3
>         Environment: Debian
>            Reporter: Eric Asselin
>            Priority: High
>              Labels: analyzer
>         Attachments: core.zip
>
>
> From a child analyzer like NTP, the IP_Hdr pointer in the DeliverPacket method is empty and unusable causing a segmentation fault as soon as you try to access it.
> To recreate the bug, just add an "assert(ip)" inside the DeliverPacket method of a UDP child analyzer and the execution will fail (instead of the segmentation fault).



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