From 4ff0aea1879b594dd6317edc50fe1fea34974f2f Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Mon, 20 Sep 2021 18:50:29 +0200
Subject: Conversion::inverse(): avoid harmless division by zero. Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39033

---
 src/iso19111/operation/conversion.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/iso19111/operation/conversion.cpp b/src/iso19111/operation/conversion.cpp
index 3db62a7d..9927892d 100644
--- a/src/iso19111/operation/conversion.cpp
+++ b/src/iso19111/operation/conversion.cpp
@@ -2493,6 +2493,9 @@ CoordinateOperationNNPtr Conversion::inverse() const {
     if (methodEPSGCode == EPSG_CODE_METHOD_CHANGE_VERTICAL_UNIT) {
         const double convFactor = parameterValueNumericAsSI(
             EPSG_CODE_PARAMETER_UNIT_CONVERSION_SCALAR);
+        if (convFactor == 0) {
+            throw InvalidOperation("Invalid conversion factor");
+        }
         auto conv = createChangeVerticalUnit(
             createPropertiesForInverse(this, false, false),
             common::Scale(1.0 / convFactor));
-- 
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