From 126991dea06eb7160fe572b147f8a74a306b5c58 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Fri, 3 Sep 2021 22:48:41 +0200
Subject: pj_obj_create(): avoid passing invalid ellipsoid parameters ot
 pj_calc_ellipsoid_params(). Fixes
 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31964

---
 src/iso19111/c_api.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/iso19111/c_api.cpp')

diff --git a/src/iso19111/c_api.cpp b/src/iso19111/c_api.cpp
index 1bf6cbf0..b27ac005 100644
--- a/src/iso19111/c_api.cpp
+++ b/src/iso19111/c_api.cpp
@@ -222,6 +222,13 @@ static PJ *pj_obj_create(PJ_CONTEXT *ctx, const IdentifiedObjectNNPtr &objIn) {
                     const auto &ellps = geodCRS->ellipsoid();
                     const double a = ellps->semiMajorAxis().getSIValue();
                     const double es = ellps->squaredEccentricity();
+                    if (!(a > 0 && es >= 0)) {
+                        proj_log_error(pj, _("Invalid ellipsoid parameters"));
+                        proj_errno_set(pj,
+                                       PROJ_ERR_INVALID_OP_ILLEGAL_ARG_VALUE);
+                        proj_destroy(pj);
+                        return nullptr;
+                    }
                     pj_calc_ellipsoid_params(pj, a, es);
                     assert(pj->geod == nullptr);
                     pj->geod = static_cast<struct geod_geodesic *>(
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