[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
 Keywords:           |
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 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>
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