From b7f5e7ea751588914eec2b64fd2ee39ac2eefc54 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 17 Apr 2020 20:37:05 +0200
Subject: ellps_shape: catch corner case where es would be set to NaN. Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=21761

---
 src/ell_set.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/ell_set.cpp')

diff --git a/src/ell_set.cpp b/src/ell_set.cpp
index 899ec1bf..434ae76d 100644
--- a/src/ell_set.cpp
+++ b/src/ell_set.cpp
@@ -318,7 +318,8 @@ static int ellps_shape (PJ *P) {
 
     }
 
-    if (P->es < 0)
+    // Written that way to catch NaN
+    if (!(P->es >= 0))
         return proj_errno_set (P, PJD_ERR_ES_LESS_THAN_ZERO);
     return 0;
 }
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