Re: NMap 7.40 Bug report, IPv6 OSscan causes fatal error on IOD deletion

Bob,

Thanks for the report and the fix! This is good analysis. I've applied a
simpler version of your fix in r36949 to clean up any remaining pcap read
events when deleting an IOD. I will try to spend a little time looking at
why the event was not deleted on Windows.

Dan

On Tue, Aug 8, 2017 at 10:00 AM, Reese, Robert <[email protected]>
wrote:

> A bug-fix for this problem has been submitted via a pull request on Github.
>
>
>
> https://github.com/nmap/nmap/pull/961
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> Thanks,
>
>
>
> Bob Reese
>
>
>
>
>
> Dr. Robert Reese
>
> Associate Professor, ECE, Mississippi State University
>
> US Mail: Box 9571, Miss State, MS 39762
>
> Courier: 406 Hardy Rd, Simrall Bldg, Miss State, MS 39762
>
> 662 325 3154 <(662)%20325-3154>
>
>
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>
> *From:* Reese, Robert
> *Sent:* Wednesday, August 02, 2017 10:21 AM
> *To:* '[email protected]' <[email protected]>
> *Subject:* NMap 7.40 Bug report, IPv6 OSscan causes fatal error on IOD
> deletion
>
>
>
> Executive summary:
>
> (I looked for this error in the archives, found one reference, but this
> looks like a different solution).
>
> Nmap 7.40 on Windows 7. Scan of two IPv6 hosts with OS detection enabled;
> OS detection on second host causes fatal error exit when it attempts to
> delete the IOD used by OS detection on the first host. The IOD delete
> function (nsock_iod.c/nsock_iod_delete function attempts to delete the
> nsock_iod, but it cannot find the pending event, so it aborts through fatal
> function in nsock/error.c with message ““Trying to delete NSI, but could
> not find the purportedly pending events on that IOD”.
>
>
>
> This was run with options:
>
> nmap -oX -  -6  -F -d4  -T3 -O  --max-hostgroup 1 -iL hosts.txt 2>
> tmperr.txt
>
>
>
> The max-hostgroup was limited to 1 to remove host parallelism. It seems to
> be immaterial which host is queried first.  This is triggered by OS scan;
> the problem does not occur when the –O option is removed.
>
>
>
> There are more details in the attached files, including debugging
> screenshots from Visual Studio 2013. I can debug this if I have a little
> help on how to proceed.
>
>
>
> Thanks,
>
>
>
> Bob R
>
>
>
>
>
>
>
> Dr. Robert Reese
>
> Associate Professor, ECE, Mississippi State University
>
> US Mail: Box 9571, Miss State, MS 39762
>
> Courier: 406 Hardy Rd, Simrall Bldg, Miss State, MS 39762
>
> 662 325 3154 <(662)%20325-3154>
>
>
>
> _______________________________________________
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> https://nmap.org/mailman/listinfo/dev
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>

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