From c5b617aadf9dfc036856303d1882cfaa98b00825 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Tue, 30 May 2017 14:26:10 +0200
Subject: PJ_ob_tran: fix crash if underlying projection has no fwd method

For example +proj=ob_tran +o_proj=hgridshift

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1927

Credit to OSS Fuzz
---
 src/PJ_ob_tran.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src')

diff --git a/src/PJ_ob_tran.c b/src/PJ_ob_tran.c
index afac5136..96752e8d 100644
--- a/src/PJ_ob_tran.c
+++ b/src/PJ_ob_tran.c
@@ -133,6 +133,9 @@ PJ *PROJECTION(ob_tran) {
     if (!(Q->link = pj_list[i].proj(Q->link))) {
         return freeup_new(P);
     }
+    if( Q->link->fwd == 0 ) {
+        return freeup_new(P);
+    }
     if (pj_param(P->ctx, P->params, "to_alpha").i) {
         double lamc, phic, alpha;
 
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