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[subset] Fix fuzzer issue. 

Fixes https://oss-fuzz.com/testcase-detail/5693568490012672. new_index should be set from new_index2 when the entry is present in the map.
This commit is contained in:
Garret Rieger 2022-06-11 01:05:57 +00:00 committed by Behdad Esfahbod
parent 4ba7980b8e
commit 311413f16b
2 changed files with 4 additions and 3 deletions
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3
src/hb-ot-post-table-v2subset.hh
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@ -87,9 +87,10 @@ HB_INTERNAL bool postV2Tail::subset (hb_subset_context_t *c) const
unsigned new_index; unsigned new_index;
const unsigned *new_index2; const unsigned *new_index2;
if (old_index <= 257) new_index = old_index; if (old_index <= 257) new_index = old_index;
else if (!old_new_index_map.has (old_index, &new_index2)) else if (old_new_index_map.has (old_index, &new_index2))
{ {
new_index = *new_index2; new_index = *new_index2;
} else {
hb_bytes_t s = _post.find_glyph_name (old_gid); hb_bytes_t s = _post.find_glyph_name (old_gid);
new_index = glyph_name_to_new_index.get (s); new_index = glyph_name_to_new_index.get (s);
if (new_index == (unsigned)-1) if (new_index == (unsigned)-1)

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test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-subset-fuzzer-5693568490012672 Normal file
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