[postgis-users] GeomUnion() crashes backend?

[strk at refractions.net]

Ok, a simple exploit for the bug is:

	SELECT geom_accum(NULL, NULL);

Fix is in CVS (pgis_1_0 branch).
If you can try it that'd be nice.

--strk;


On Mon, Nov 28, 2005 at 04:34:40PM +0100, strk at refractions.net wrote:
> I can reproduce the bug on Postgis-HEAD, PGSQL800.
> accum(pgpoly) is enough, so it's not GEOS-related.
> 
> One geometry is NULL, and that's the problem.
> Tested on PGSQL7.3.4 everything works, so NULL
> handling must have changed between PGSQL versions ..
> 
> I'm checking this.
> 
> --strk;
> 
> 
> On Mon, Nov 28, 2005 at 03:11:41PM +0100, Hubert Fröhlich wrote:
> > Hi list,
> > 
> > I am using Postgres on Linux boxes (SuSE 9.3 and 10.2); I use
> > 
> > PostgreSQL 8.0.3, Geos 2.1.2, Postgis 1.0.2 combination on several HP 
> > ProLiant ( Xeon and also Opteron) servers
> > PostgreSQL 8.1.0, Geos 2.1.4, Postgis 1.0.4 combination on a pentium4 
> > desktop.
> > 
> > I am doing Postgis GeomUnion() on 3 polygons; 2 of them are relatively 
> > large (npoints> 500), one of them is NULL (dont ask me why this is NULL!) .
> > 
> > The dump is enclosed. (does the attachment get through the firewall? if 
> > not, i can mail separately).
> > 
> > When I try
> > testpoly=# select geomunion(pgpoly) from testpoly2;
> > server closed the connection unexpectedly
> >         This probably means the server terminated abnormally
> >         before or while processing the request.
> > The connection to the server was lost. Attempting reset: Failed.
> > 
> > I get a backend crash.
> > 
> > What has happened?
> > 
> > 
> > 
> > I am
> > -- 
> > Mit freundlichen Grüßen / With kind regards
> > 
> > Hubert Fröhlich
> > 
> > -------------------------------------------------------------------------------
> > Dr.-Ing. Hubert Fröhlich
> > Landesamt für Vermessung und Geoinformation
> > Alexandrastr. 4, D-80538 München, GERMANY
> > Tel. :+49 (0)89 / 2129 - 2980
> > Fax  :+49 (0)89 / 2129 - 2997
> > hubert dot froehlich at lvg dot bayern dot de
> 
> 
> > _______________________________________________
> > postgis-users mailing list
> > postgis-users at postgis.refractions.net
> > http://postgis.refractions.net/mailman/listinfo/postgis-users
> 
> 
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