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https://bro-tracker.atlassian.net/browse/BIT-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19204#comment-19204
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Eric Asselin edited comment on BIT-1298 at 12/9/14 4:03 PM:
------------------------------------------------------------
Here's the code example from NTP.cc:
void NTP_Analyzer::DeliverPacket(int len, const u_char* data, bool is_orig,
uint64 seq, const IP_Hdr* ip, int caplen)
{
ip->SrcAddr(); // or assert(ip)
...
}
was (Author: easselin):
Here's the code example from NTP.cc:
void NTP_Analyzer::DeliverPacket(int len, const u_char* data, bool is_orig,
uint64 seq, const IP_Hdr* ip, int caplen)
{
ip->SrcAddr(); // or assert(ip)
...
}
> 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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