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[otlayout] Avoid invalid access with Context format 3

This commit is contained in:
Behdad Esfahbod 2014-12-12 20:54:28 -08:00
parent 295ef1dd52
commit 9df0a52030
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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@ -1498,6 +1498,7 @@ struct ContextFormat3
TRACE_SANITIZE (this);
if (!c->check_struct (this)) return TRACE_RETURN (false);
unsigned int count = glyphCount;
if (!count) return TRACE_RETURN (false); /* We want to access coverage[0] freely. */
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);
@ -2109,6 +2110,7 @@ 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 (!input.len) return TRACE_RETURN (false); /* To be consistent with Context. */
OffsetArrayOf<Coverage> &lookahead = StructAfter<OffsetArrayOf<Coverage> > (input);
if (!lookahead.sanitize (c, this)) return TRACE_RETURN (false);
ArrayOf<LookupRecord> &lookup = StructAfter<ArrayOf<LookupRecord> > (lookahead);