[postgis-tickets] [PostGIS] #3897: test_lwgeom_clip_by_rect has triggers bad memory access

[PostGIS]

#3897: test_lwgeom_clip_by_rect has triggers bad memory access
---------------------+---------------------------
 Reporter:  komzpa   |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  high     |  Milestone:  PostGIS 2.4.1
Component:  postgis  |    Version:  2.4.x
 Keywords:           |
---------------------+---------------------------
 While enabling -fsanitize=address for Travis it found an issue in existing
 code:

 https://travis-ci.org/postgis/postgis/builds/286570017#L4739

 {{{
   Test: test_lwgeom_clip_by_rect ...ASAN:SIGSEGV
 =================================================================
 ==32713== ERROR: AddressSanitizer: SEGV on unknown address 0x00000000000c
 (pc 0x2b1afafcc640 sp 0x7ffcbbe2e9b0 bp 0x7ffcbbe2e9d0 T0)
 AddressSanitizer can not provide additional info.
     #0 0x2b1afafcc63f
 (/home/travis/build/postgis/postgis/liblwgeom/.libs/liblwgeom-2.5.so.0.0.0+0xde63f)
     #1 0x2b1afafccc35
 (/home/travis/build/postgis/postgis/liblwgeom/.libs/liblwgeom-2.5.so.0.0.0+0xdec35)
     #2 0x2b1afafce2db
 (/home/travis/build/postgis/postgis/liblwgeom/.libs/liblwgeom-2.5.so.0.0.0+0xe02db)
     #3 0x4335d0 (/home/travis/build/postgis/postgis/liblwgeom/cunit/.libs
 /lt-cu_tester+0x4335d0)
     #4 0x2b1afb47ac99 (/usr/lib/libcunit.so.1.0.1+0x3c99)
     #5 0x2b1afb47af27 (/usr/lib/libcunit.so.1.0.1+0x3f27)
     #6 0x2b1afb47b2a5 (/usr/lib/libcunit.so.1.0.1+0x42a5)
     #7 0x407dbb (/home/travis/build/postgis/postgis/liblwgeom/cunit/.libs
 /lt-cu_tester+0x407dbb)
     #8 0x2b1afb9acf44 (/lib/x86_64-linux-gnu/libc-2.19.so+0x21f44)
     #9 0x407e81 (/home/travis/build/postgis/postgis/liblwgeom/cunit/.libs
 /lt-cu_tester+0x407e81)
 ==32713== ABORTING
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3897>
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