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Merge some TTF sanity check fixes from the TTF project.

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Michael R Sweet 2024-08-09 10:54:28 -04:00
parent 90923c3818
commit f3f70e7877
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2 changed files with 45 additions and 11 deletions
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6
CHANGES.md
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@ -2,6 +2,12 @@ Changes in PDFio
================
v1.3.2 (Month DD, YYYY)
-----------------------
- Added some more sanity checks to the TrueType font reader.
v1.3.1 (August 5, 2024)
-----------------------

50
ttf.c
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@ -100,6 +100,8 @@ typedef __int64 ssize_t; // POSIX type not present on Windows...
#define TTF_FONT_MAX_CHAR 262144 // Maximum number of character values
#define TTF_FONT_MAX_GROUPS 65536 // Maximum number of sub-groups
#define TTF_FONT_MAX_NAMES 16777216// Maximum size of names table we support
//
// TTF/OFF tag constants...
@ -254,7 +256,7 @@ typedef struct _ttf_off_hhea_s // Horizontal header
{
short ascender, // Ascender
descender; // Descender
int numberOfHMetrics; // Number of horizontal metrics
unsigned short numberOfHMetrics; // Number of horizontal metrics
} _ttf_off_hhea_t;
typedef struct _ttf_off_os_2_s // OS/2 information
@ -1272,20 +1274,27 @@ read_cmap(ttf_t *font) // I - Font
for (i = 0; i < numGlyphIdArray; i ++)
glyphIdArray[i] = read_ushort(font);
#ifdef DEBUG
for (i = 0; i < segCount; i ++)
TTF_DEBUG("read_cmap: segment[%d].startCode=%d, endCode=%d, idDelta=%d, idRangeOffset=%d\n", i, segments[i].startCode, segments[i].endCode, segments[i].idDelta, segments[i].idRangeOffset);
for (i = 0, segment = segments; i < segCount; i ++, segment ++)
{
TTF_DEBUG("read_cmap: segment[%d].startCode=%d, endCode=%d, idDelta=%d, idRangeOffset=%d\n", i, segment->startCode, segment->endCode, segment->idDelta, segment->idRangeOffset);
if (segment->startCode > segment->endCode)
{
errorf(font, "Bad cmap table segment %u to %u.", segments->startCode, segment->endCode);
return (false);
}
// Based on the end code of the segment table, allocate space for the
// uncompressed cmap table...
if (segment->endCode >= font->num_cmap)
font->num_cmap = segment->endCode + 1;
}
#ifdef DEBUG
for (i = 0; i < numGlyphIdArray; i ++)
TTF_DEBUG("read_cmap: glyphIdArray[%d]=%d\n", i, glyphIdArray[i]);
#endif /* DEBUG */
// Based on the end code of the segent table, allocate space for the
// uncompressed cmap table...
// segCount --; // Last segment is not used (sigh)
font->num_cmap = segments[segCount - 1].endCode + 1;
if (font->num_cmap > TTF_FONT_MAX_CHAR)
{
errorf(font, "Invalid cmap table with %u characters.", (unsigned)font->num_cmap);
@ -1382,6 +1391,12 @@ read_cmap(ttf_t *font) // I - Font
group->startGlyphID = read_ulong(font);
TTF_DEBUG("read_cmap: [%u] startCharCode=%u, endCharCode=%u, startGlyphID=%u\n", gidx, group->startCharCode, group->endCharCode, group->startGlyphID);
if (group->startCharCode > group->endCharCode)
{
errorf(font, "Bad cmap table segment %u to %u.", group->startCharCode, group->endCharCode);
return (false);
}
if (group->endCharCode >= font->num_cmap)
font->num_cmap = group->endCharCode + 1;
}
@ -1465,6 +1480,12 @@ read_cmap(ttf_t *font) // I - Font
group->glyphID = read_ulong(font);
TTF_DEBUG("read_cmap: [%u] startCharCode=%u, endCharCode=%u, glyphID=%u\n", gidx, group->startCharCode, group->endCharCode, group->glyphID);
if (group->startCharCode > group->endCharCode)
{
errorf(font, "Bad cmap table segment %u to %u.", group->startCharCode, group->endCharCode);
return (false);
}
if (group->endCharCode >= font->num_cmap)
font->num_cmap = group->endCharCode + 1;
}
@ -1598,7 +1619,7 @@ read_hmtx(ttf_t *font, // I - Font
_ttf_off_hhea_t *hhea) // O - hhea table data
{
unsigned length; // Length of hmtx table
int i; // Looping var
unsigned i; // Looping var
_ttf_metric_t *widths; // Glyph metrics array
@ -1677,8 +1698,15 @@ read_names(ttf_t *font) // I - Font
return (false);
font->names.storage_size = length - (unsigned)offset;
if (font->names.storage_size > TTF_FONT_MAX_NAMES)
{
errorf(font, "Name table too large - %u bytes.", (unsigned)font->names.storage_size);
return (false);
}
if ((font->names.storage = malloc(font->names.storage_size)) == NULL)
return (false);
memset(font->names.storage, 'A', font->names.storage_size);
for (i = font->names.num_names, name = font->names.names; i > 0; i --, name ++)