[PostGIS] #6015: Server Crash accessing Linestring as MultiLinestring

[PostGIS]

#6015: Server Crash accessing Linestring as MultiLinestring
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  Reporter:  fomp     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.6.1
 Component:  postgis  |    Version:  3.6.x
Resolution:           |   Keywords:
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Description changed by fomp:

Old description:

> This code produces on a segmentation fault:
>
> CREATE TABLE geom (geo GEOMETRY(Geometry,31467));
> INSERT INTO geom VALUES ('SRID=31467;LINESTRING(1 1, 2 3, 5 4)');
> SELECT ST_SRID(ST_GeometryN(geo, 1)) FROM geom; -- returns wrong SRID
> SELECT ST_Transform(ST_GeometryN(geo, 1), 4326) FROM geom; -- CRASH!
>
> The segmentation fault happens only, when the Linestring is stored in a
> table.
>
> Linux Debian 12.12 on x86_64
> postgresql-16 (16.10-1.pgdg12+1)
> postgresql-16-postgis-3 (3.6.0+dfsg-2.pgdg12+1)

New description:

 This code produces on a segmentation fault:

 {{{
 CREATE TABLE geom (geo GEOMETRY(Geometry,31467));
 INSERT INTO geom VALUES ('SRID=31467;LINESTRING(1 1, 2 3, 5 4)');
 SELECT ST_SRID(ST_GeometryN(geo, 1)) FROM geom; -- returns wrong SRID
 SELECT ST_Transform(ST_GeometryN(geo, 1), 4326) FROM geom; -- CRASH!
 }}}


 The segmentation fault happens only, when the Linestring is stored in a
 table.

 Linux Debian 12.12 on x86_64
 postgresql-16 (16.10-1.pgdg12+1)
 postgresql-16-postgis-3 (3.6.0+dfsg-2.pgdg12+1)

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6015#comment:1>
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