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Add underflow detection to TTF cmap code.

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Michael R Sweet
2025-08-27 11:21:16 -04:00
parent dc584c0868
commit 410e3b92ea
2 changed files with 7 additions and 1 deletions
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6
CHANGES.md
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@@ -2,6 +2,12 @@ Changes in PDFio
================ ================
v1.5.5 - YYYY-MM-DD
-------------------
- Fixed TTF cmap underflow error.
v1.5.4 - 2025-08-26 v1.5.4 - 2025-08-26
------------------- -------------------

2
ttf.c
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@@ -1205,7 +1205,7 @@ read_cmap(ttf_t *font) // I - Font
/* language = */ read_ushort(font); /* language = */ read_ushort(font);
if (length > (256 + 6)) if (length > (256 + 6) || length < 7)
{ {
errorf(font, "Bad cmap table length at offset %u.", coffset); errorf(font, "Bad cmap table length at offset %u.", coffset);
return (false); return (false);