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[sbix] Check offsets before proceeding

This commit is contained in:
Behdad Esfahbod 2018-10-28 15:27:04 -07:00
parent c8380bd3e4
commit d7eb534e59
1 changed files with 2 additions and 1 deletions
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3
src/hb-ot-color-sbix-table.hh
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@ -89,7 +89,8 @@ struct SBIXStrike
{
unsigned int sbix_len = sbix_blob->length;
unsigned int strike_offset = (const char *) this - (const char *) sbix_blob->data;
if (imageOffsetsZ[glyph_id + 1] - imageOffsetsZ[glyph_id] == 0)
if (imageOffsetsZ[glyph_id + 1] < imageOffsetsZ[glyph_id] ||
imageOffsetsZ[glyph_id + 1] - imageOffsetsZ[glyph_id] <= SBIXGlyph::min_size)
return hb_blob_get_empty ();
if (strike_offset + (unsigned int) imageOffsetsZ[glyph_id] + SBIXGlyph::min_size > sbix_len)