commit 740fdbcd0e6d25c1d6f12537ca2aa559650b9d52
author jfkthame <jfkthame@gmail.com> Mon Apr 03 12:22:39 2017 +0100
committer Behdad Esfahbod <behdad@behdad.org> Mon Apr 03 13:22:39 2017 +0200
tree 30d50be5c02075a797b739b225bc48bbb5e29cf9
parent 8d256841ca7462fd596329abf6f71bafb56fd621

avoid UBSan warning in get_stage_lookups (#450)

See https://bugzilla.mozilla.org/show_bug.cgi?id=1336600

src/hb-ot-map-private.hh

diff --git a/src/hb-ot-map-private.hh b/src/hb-ot-map-private.hh
index 0395c9c..b69e534 100644
--- a/src/hb-ot-map-private.hh
+++ b/src/hb-ot-map-private.hh
@@ -113,7 +113,7 @@
     assert (stage <= stages[table_index].len);
     unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0;
     unsigned int end   = stage < stages[table_index].len ? stages[table_index][stage].last_lookup : lookups[table_index].len;
-    *plookups = &lookups[table_index][start];
+    *plookups = end == start ? NULL : &lookups[table_index][start];
     *lookup_count = end - start;
   }