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[GSUB/GPOS] Reject Context/ChainContext lookups with zero input

This commit is contained in:
Behdad Esfahbod 2012-07-28 17:01:59 -04:00
parent 2f87cebe10
commit 0981068b75
1 changed files with 2 additions and 0 deletions
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2
src/hb-ot-layout-gsubgpos-private.hh
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@ -857,6 +857,7 @@ struct ContextFormat3
TRACE_SANITIZE ();
if (!c->check_struct (this)) return TRACE_RETURN (false);
unsigned int count = glyphCount;
if (unlikely (!glyphCount)) return TRACE_RETURN (false);
if (!c->check_array (coverage, coverage[0].static_size, count)) return TRACE_RETURN (false);
for (unsigned int i = 0; i < count; i++)
if (!coverage[i].sanitize (c, this)) return TRACE_RETURN (false);
@ -1386,6 +1387,7 @@ struct ChainContextFormat3
if (!backtrack.sanitize (c, this)) return TRACE_RETURN (false);
OffsetArrayOf<Coverage> &input = StructAfter<OffsetArrayOf<Coverage> > (backtrack);
if (!input.sanitize (c, this)) return TRACE_RETURN (false);
if (unlikely (!input.len)) return TRACE_RETURN (false);
OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
if (!lookahead.sanitize (c, this)) return TRACE_RETURN (false);
ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);