From 20b1fac56fc23950790b2f46761b8308d455daa9 Mon Sep 17 00:00:00 2001 From: Even Rouault Date: Wed, 20 Mar 2019 11:46:39 +0100 Subject: sterea: prevent division by zero Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13790 Credit to OSS Fuzz --- src/projections/sterea.cpp | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'src') diff --git a/src/projections/sterea.cpp b/src/projections/sterea.cpp index b6ebc7b4..964bb588 100644 --- a/src/projections/sterea.cpp +++ b/src/projections/sterea.cpp @@ -53,7 +53,12 @@ static PJ_XY e_forward (PJ_LP lp, PJ *P) { /* Ellipsoidal, forward */ sinc = sin(lp.phi); cosc = cos(lp.phi); cosl = cos(lp.lam); - k = P->k0 * Q->R2 / (1. + Q->sinc0 * sinc + Q->cosc0 * cosc * cosl); + const double denom = 1. + Q->sinc0 * sinc + Q->cosc0 * cosc * cosl; + if( denom == 0.0 ) { + proj_errno_set(P, PJD_ERR_TOLERANCE_CONDITION); + return proj_coord_error().xy; + } + k = P->k0 * Q->R2 / denom; xy.x = k * cosc * sin(lp.lam); xy.y = k * (Q->cosc0 * sinc - Q->sinc0 * cosc * cosl); return xy; -- cgit v1.2.3