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Re: [gpsd-dev] Tricky bug in the json parser

From: Eric S. Raymond
Subject: Re: [gpsd-dev] Tricky bug in the json parser
Date: Tue, 19 Jun 2012 20:52:13 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

Christian Gagneraud <address@hidden>:
> Hi all,
> I just have one last bug to fix from my live test campaign. and it
> is a bit tricky to understand for me as I have to dive into the
> hairy json.c.
> So basically, here are 2 AIS sentences which contain an array of 1 struct:
> !AIVDM,1,1,,A,address@hidden,0*02
> !AIVDM,1,1,,A,6h2E3N0rThqP0600J00000000000,0*51
> The dumping doesn't seems to cause any trouble, but reading back the
> JSON crashes gpsdecode:
> echo '!AIVDM,1,1,,A,address@hidden,0*02' | gpsdecode -ju
> {"class":"AIS","device":"stdin","type":6,"repeat":3,"mmsi":2442101,"scaled":false,"seqno":2,"dest_mmsi":246351000,"retransmit":false,"dac":1,"fid":32,"month":0,"day":0,"tidals":[{"lon":-16777216,"lat":0,"from_hour":0,"from_min":0,"to_hour":0,"to_min":0,"cdir":0,"cspeed":0}]}
> echo '!AIVDM,1,1,,A,address@hidden,0*02' | gpsdecode
> -ju | gpsdecode -jeu
> Segmentation fault
> I saw some other messages with arrays of 0 structures, they don't
> crash the json parser.

I'm getting back to GPSD after spending a week and a half immersed in 
another project.  Did this one get fixed?
                <a href="";>Eric S. Raymond</a>

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