From: Axel Naumann <Axel.Naumann@cern.ch>
Date: Mon, 22 Sep 2014 19:23:58 +0000 (+0200)
Subject: Degenerate floats cast to int can do amazing things.
X-Git-Tag: v6-02-00-rc1~34
X-Git-Url: https://root.cern.ch/gitweb?p=root.git;a=commitdiff_plain;h=0e30aec98d00c19b7d110d3dcf8f13408252d051

Degenerate floats cast to int can do amazing things.
---

diff --git a/math/mathcore/src/AdaptiveIntegratorMultiDim.cxx b/math/mathcore/src/AdaptiveIntegratorMultiDim.cxx
index 85a61b8..2757150 100644
--- a/math/mathcore/src/AdaptiveIntegratorMultiDim.cxx
+++ b/math/mathcore/src/AdaptiveIntegratorMultiDim.cxx
@@ -345,6 +345,11 @@ L160: //to divide or not
          ctr[j] = wk[isbtmp];
          wth[j] = wk[isbtmp-1];
       }
+      if (idvax0 < 1) {
+         // Can happen for overflows / degenerate floats.
+         idvax0 = 1;
+         ::Error("AdaptiveIntegratorMultiDim::DoIntegral()", "Logic error: idvax0 < 1!");
+      }
       wth[idvax0-1]  = 0.5*wth[idvax0-1];
       ctr[idvax0-1] -= wth[idvax0-1];
       goto L20;