[PostGIS] #5921: pfree of NULL in gserialized_sel_internal()

[PostGIS]

#5921: pfree of NULL in gserialized_sel_internal()
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 Reporter:  arseniymukhin  |      Owner:  pramsey
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 3.5.4
Component:  postgis        |    Version:  master
 Keywords:                 |
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 Hi,

 The current code doesn't check if nd_stat is NULL before pfree, which can
 result in segfault. I caught segfault while executing a query on freshly
 restored data from dump with statistics. Postgres 18 new feature -
 export/import statistics, let you dump statistics, but it does not
 transfer statistics with custom stakind, so nd_stat in
 gserialized_sel_internal() can be NULL.


 Please find the attached patch fixing this.


 Best regards,
 Arseniy Mukhin
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5921>
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