From 4cb9fdb63148d1281bbecf30a645a26367a18985 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sun, 14 Nov 2021 15:49:25 +0100
Subject: Merge pull request #2938 from rouault/fix_ossfuzz_40955

createOperationsCompoundToCompound(): fix null pointer dereference when connection to proj.db doesn't exist.
---
 src/iso19111/operation/coordinateoperationfactory.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/iso19111/operation/coordinateoperationfactory.cpp b/src/iso19111/operation/coordinateoperationfactory.cpp
index e9bd3cfe..9b891888 100644
--- a/src/iso19111/operation/coordinateoperationfactory.cpp
+++ b/src/iso19111/operation/coordinateoperationfactory.cpp
@@ -5250,8 +5250,10 @@ void CoordinateOperationFactory::Private::createOperationsCompoundToCompound(
     // and a geoid model for Belfast height referenced to ETRS89
     if (verticalTransforms.size() == 1 &&
         verticalTransforms.front()->hasBallparkTransformation()) {
-        auto dbContext =
-            context.context->getAuthorityFactory()->databaseContext();
+        const auto &authFactory = context.context->getAuthorityFactory();
+        auto dbContext = authFactory
+                             ? authFactory->databaseContext().as_nullable()
+                             : nullptr;
         const auto intermGeogSrc =
             srcGeog->promoteTo3D(std::string(), dbContext);
         const bool intermGeogSrcIsSameAsIntermGeogDst =
-- 
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