GEOSConcaveHullOfPolygons: Avoid crash on zero-area input (#1076)

* GEOSConcaveHullOfPolygons: Avoid crash on zero-area input Resolves #1071
libgeos · Jun 20, 2024 · fc0722f · fc0722f
1 parent 87e98b7
commit fc0722f
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/src/algorithm/hull/ConcaveHullOfPolygons.cpp b/src/algorithm/hull/ConcaveHullOfPolygons.cpp
@@ -156,7 +156,7 @@ ConcaveHullOfPolygons::setTight(bool p_isTight)
 std::unique_ptr<Geometry>
 ConcaveHullOfPolygons::getHull()
 {
-    if (inputPolygons->isEmpty()) {
+    if (inputPolygons->isEmpty() || inputPolygons->getArea() == 0) {
         return createEmptyHull();
     }
     buildHullTris();

diff --git a/tests/unit/capi/GEOSConcaveHullOfPolygonsTest.cpp b/tests/unit/capi/GEOSConcaveHullOfPolygonsTest.cpp
@@ -62,6 +62,15 @@ void object::test<3>()
     result_ = GEOSConcaveHullOfPolygons(input_, 0.7, false, false);
     ensure("curved geometry not supported", result_ == nullptr);
 }
+
+template<>
+template<>
+void object::test<4>()
+{
+    input_ = fromWKT("POLYGON((0 0, 0 0, 0 0))");
+    result_ = GEOSConcaveHullOfPolygons(input_, 0.7, false, false);
+    ensure(GEOSisEmpty(result_));
+}
 
 
 } // namespace tut