From 44fc7dda9fc411f7c2f052c2271d563bc52f2518 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 15 Mar 2019 20:17:28 +0100
Subject: ellps_spherification(): detect invalid semi-major axis value

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12909
Credit to OSS Fuzz
---
 src/ell_set.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/ell_set.cpp')

diff --git a/src/ell_set.cpp b/src/ell_set.cpp
index 71746895..386b4f46 100644
--- a/src/ell_set.cpp
+++ b/src/ell_set.cpp
@@ -399,6 +399,10 @@ static int ellps_spherification (PJ *P) {
         break;
     }
 
+    if (P->a <= 0.) {
+        return proj_errno_set(P, PJD_ERR_MAJOR_AXIS_NOT_GIVEN);
+    }
+
     /* Clean up the ellipsoidal parameters to reflect the sphere */
     P->es = P->e = P->f = 0;
     P->rf = HUGE_VAL;
-- 
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