[postgis-tickets] [PostGIS] #4031: ST_CurveToLine with small tolerance sometimes causes invalid memory alloc request size

[PostGIS]

#4031: ST_CurveToLine with small tolerance sometimes causes invalid memory alloc
request size
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  Reporter:  kkgeodk  |      Owner:  strk
      Type:  defect   |     Status:  assigned
  Priority:  medium   |  Milestone:  PostGIS 2.5.0
 Component:  postgis  |    Version:  2.2.x
Resolution:           |   Keywords:  ST_CurveToLine
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Comment (by strk):

 @kkgeodk can you confirm r16553 fixes the problem for you ?
 In the specific case you reported even 0.01 tolerance was too big for that
 specific arc in the set of curves (there was a very tiny curve in the
 set). The patch in r16553 would allow you to still use 0.01 (or even 1) as
 a max deviance w/out that ever being a problem against smaller curves.

 Once confirmed, the patch should be backported to all supported branches.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4031#comment:11>
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