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fuzzer crash fix 

https://oss-fuzz.com/testcase-detail/5643107869917184
This commit is contained in:
Qunxin Liu 2019-10-24 15:15:26 -07:00 committed by Garret Rieger
parent 9815ca0338
commit b2fcca6e14
2 changed files with 7 additions and 4 deletions
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11
src/hb-ot-layout-gsubgpos.hh
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@ -2051,12 +2051,15 @@ struct ChainRule
{ {
TRACE_SUBSET (this); TRACE_SUBSET (this);
const HeadlessArrayOf<HBUINT16> &input = StructAfter<HeadlessArrayOf<HBUINT16>> (backtrack);
const ArrayOf<HBUINT16> &lookahead = StructAfter<ArrayOf<HBUINT16>> (input);
if (!backtrack_map) if (!backtrack_map)
{ {
const hb_set_t &glyphset = *c->plan->glyphset (); const hb_set_t &glyphset = *c->plan->glyphset ();
if (!hb_all (backtrack, glyphset) || if (!hb_all (backtrack, glyphset) ||
!hb_all (inputX, glyphset) || !hb_all (input, glyphset) ||
!hb_all (lookaheadX, glyphset)) !hb_all (lookahead, glyphset))
return_trace (false); return_trace (false);
copy (c->serializer, c->plan->glyph_map); copy (c->serializer, c->plan->glyph_map);
@ -2064,8 +2067,8 @@ struct ChainRule
else else
{ {
if (!hb_all (backtrack, backtrack_map) || if (!hb_all (backtrack, backtrack_map) ||
!hb_all (inputX, input_map) || !hb_all (input, input_map) ||
!hb_all (lookaheadX, lookahead_map)) !hb_all (lookahead, lookahead_map))
return_trace (false); return_trace (false);
copy (c->serializer, backtrack_map, input_map, lookahead_map); copy (c->serializer, backtrack_map, input_map, lookahead_map);

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test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5643107869917184 Normal file
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