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[GSUB] Protect against mismatching Extension subtable types

This commit is contained in:
Behdad Esfahbod 2009-05-18 06:00:12 -04:00
parent 969afd706e
commit 8533bb985e
1 changed files with 6 additions and 3 deletions
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9
src/hb-ot-layout-gsub-private.h
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@ -679,10 +679,13 @@ struct SubstLookup : Lookup {
unsigned int type = get_type ();
if (HB_UNLIKELY (type == GSUB_Extension)) {
/* Return lookup type of first extension subtable.
* The spec says all of them should have the same type.
* XXX check for that in sanitize() */
unsigned int count = get_subtable_count ();
type = get_subtable(0).u.extension->get_type ();
/* The spec says all subtables should have the same type.
* This is specially important if one has a reverse type! */
for (unsigned int i = 1; i < count; i++)
if (get_subtable(i).u.extension->get_type () != type)
return 0;
}
return type;