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LibGfx/OpenType: Ensure Cmap subtable offset is within expected range

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This commit is contained in:
Tim Ledbetter 2023-11-11 17:06:17 +00:00 • committed by Andreas Kling
parent 6d1a1daff9
commit cdfe893717
2 changed files with 11 additions and 2 deletions
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2
Userland/Libraries/LibGfx/Font/OpenType/Cmap.cpp
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@ -68,6 +68,8 @@ Optional<Cmap::Subtable> Cmap::subtable(u32 index) const
return {};
}
u32 record_offset = (u32)Sizes::TableHeader + index * (u32)Sizes::EncodingRecord;
if (record_offset + (u32)Offsets::EncodingRecord_Offset >= m_slice.size())
return {};
u16 platform_id = be_u16(m_slice.offset(record_offset));
u16 encoding_id = be_u16(m_slice.offset(record_offset + (u32)Offsets::EncodingRecord_EncodingID));
u32 subtable_offset = be_u32(m_slice.offset(record_offset + (u32)Offsets::EncodingRecord_Offset));