commit 6e7cbc713ae584d195f77845d6cafcdc80fb64ab
author Albert Astals Cid <aacid@kde.org> Sat Dec 22 11:11:59 2018 +0100
committer Albert Astals Cid <aacid@kde.org> Sat Dec 22 11:11:59 2018 +0100
tree 33a8cce1fa07fd2ad7dd8954fd678e10723a9439
parent 61fe5ae92794feaaaf4eb8abb01d55d152e28dd7

Gfx::doTilingPatternFill: Fix undefined behaviour

oss-fuzz/8548

poppler/Gfx.cc

diff --git a/poppler/Gfx.cc b/poppler/Gfx.cc
index 2b53ea0..8dc2dc9 100644
--- a/poppler/Gfx.cc
+++ b/poppler/Gfx.cc
@@ -2187,6 +2187,9 @@
   //~ edge instead of left/bottom (?)
   xstep = fabs(tPat->getXStep());
   ystep = fabs(tPat->getYStep());
+  if (unlikely(xstep == 0 || ystep == 0)) {
+      goto restore;
+  }
   if (tPat->getBBox()[0] < tPat->getBBox()[2]) {
     xi0 = (int)ceil((xMin - tPat->getBBox()[2]) / xstep);
     xi1 = (int)floor((xMax - tPat->getBBox()[0]) / xstep) + 1;