commit 5f17dbc3025093308d2191a4abd2eec24db35c0e
author Behdad Esfahbod <behdad@behdad.org> Fri Sep 07 10:24:22 2018 -0400
committer Behdad Esfahbod <behdad@behdad.org> Fri Sep 07 10:24:22 2018 -0400
tree a841ceefe549bb1d263bf5e6d28b8c506bfe01e8
parent 21bf147054f6b5bd1c430c0e02a8c4058ed229a1

[subset] Fix div-by-zero

src/hb-subset.cc

diff --git a/src/hb-subset.cc b/src/hb-subset.cc
index adc7c51..2bed358 100644
--- a/src/hb-subset.cc
+++ b/src/hb-subset.cc
@@ -51,6 +51,9 @@
   unsigned int src_glyphs = plan->source->get_num_glyphs ();
   unsigned int dst_glyphs = plan->glyphset->get_population ();
 
+  if (unlikely (!src_glyphs))
+    return 512 + table_len;
+
   return 512 + (unsigned int) (table_len * sqrt ((double) dst_glyphs / src_glyphs));
 }