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dwrite: Validate 'COLR' data before using it. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2019-01-29 10:06:42 +03:00 committed by Alexandre Julliard
parent ca29ac4650
commit 1ee9685003
3 changed files with 65 additions and 46 deletions
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6
dlls/dwrite/dwrite_private.h
View File

@ -245,8 +245,10 @@ struct dwrite_colorglyph {
UINT16 palette_index;
};
extern HRESULT opentype_get_colr_glyph(const void*,UINT16,struct dwrite_colorglyph*) DECLSPEC_HIDDEN;
extern void opentype_colr_next_glyph(const void*,struct dwrite_colorglyph*) DECLSPEC_HIDDEN;
extern HRESULT opentype_get_colr_glyph(const struct dwrite_fonttable *table, UINT16 glyph,
struct dwrite_colorglyph *color_glyph) DECLSPEC_HIDDEN;
extern void opentype_colr_next_glyph(const struct dwrite_fonttable *table,
struct dwrite_colorglyph *color_glyph) DECLSPEC_HIDDEN;
enum gasp_flags {
GASP_GRIDFIT = 0x0001,

4
dlls/dwrite/font.c
View File

@ -5649,7 +5649,7 @@ static BOOL colorglyphenum_build_color_run(struct dwrite_colorglyphenum *glyphen
/* offsets are relative to glyph origin, nothing to fix up */
if (glyphenum->color_offsets)
glyphenum->color_offsets[index] = glyphenum->offsets[g];
opentype_colr_next_glyph(glyphenum->colr.data, glyphenum->glyphs + g);
opentype_colr_next_glyph(&glyphenum->colr, glyphenum->glyphs + g);
if (index)
glyphenum->color_advances[index-1] += advance_adj;
colorrun->glyphRun.glyphCount++;
@ -5755,7 +5755,7 @@ HRESULT create_colorglyphenum(float originX, float originY, const DWRITE_GLYPH_R
has_colored_glyph = FALSE;
colorglyphenum->has_regular_glyphs = FALSE;
for (i = 0; i < run->glyphCount; i++) {
if (opentype_get_colr_glyph(colorglyphenum->colr.data, run->glyphIndices[i], colorglyphenum->glyphs + i) == S_OK) {
if (opentype_get_colr_glyph(&colorglyphenum->colr, run->glyphIndices[i], colorglyphenum->glyphs + i) == S_OK) {
colorglyphenum->max_layer_num = max(colorglyphenum->max_layer_num, colorglyphenum->glyphs[i].num_layers);
has_colored_glyph = TRUE;
}

101
dlls/dwrite/opentype.c
View File

@ -862,26 +862,26 @@ struct cpal_color_record
};
/* COLR table */
struct COLR_Header
struct colr_header
{
USHORT version;
USHORT numBaseGlyphRecords;
ULONG offsetBaseGlyphRecord;
ULONG offsetLayerRecord;
USHORT numLayerRecords;
USHORT num_baseglyph_records;
ULONG offset_baseglyph_records;
ULONG offset_layer_records;
USHORT num_layer_records;
};
struct COLR_BaseGlyphRecord
struct colr_baseglyph_record
{
USHORT GID;
USHORT firstLayerIndex;
USHORT numLayers;
USHORT glyph;
USHORT first_layer_index;
USHORT num_layers;
};
struct COLR_LayerRecord
struct colr_layer_record
{
USHORT GID;
USHORT paletteIndex;
USHORT glyph;
USHORT palette_index;
};
static const void *table_read_ensure(const struct dwrite_fonttable *table, unsigned int offset, unsigned int size)
@ -2050,8 +2050,8 @@ HRESULT opentype_get_cpal_entries(const struct dwrite_fonttable *cpal, unsigned
static int colr_compare_gid(const void *g, const void *r)
{
const struct COLR_BaseGlyphRecord *record = r;
UINT16 glyph = *(UINT16*)g, GID = GET_BE_WORD(record->GID);
const struct colr_baseglyph_record *record = r;
UINT16 glyph = *(UINT16*)g, GID = GET_BE_WORD(record->glyph);
int ret = 0;
if (glyph > GID)
@ -2062,51 +2062,68 @@ static int colr_compare_gid(const void *g, const void *r)
return ret;
}
HRESULT opentype_get_colr_glyph(const void *colr, UINT16 glyph, struct dwrite_colorglyph *ret)
HRESULT opentype_get_colr_glyph(const struct dwrite_fonttable *colr, UINT16 glyph, struct dwrite_colorglyph *ret)
{
const struct COLR_BaseGlyphRecord *record;
const struct COLR_Header *header = colr;
const struct COLR_LayerRecord *layer;
DWORD layerrecordoffset = GET_BE_DWORD(header->offsetLayerRecord);
DWORD baserecordoffset = GET_BE_DWORD(header->offsetBaseGlyphRecord);
WORD numbaserecords = GET_BE_WORD(header->numBaseGlyphRecords);
unsigned int num_baseglyph_records, offset_baseglyph_records;
const struct colr_baseglyph_record *record;
const struct colr_layer_record *layer;
const struct colr_header *header;
record = bsearch(&glyph, (BYTE*)colr + baserecordoffset, numbaserecords, sizeof(struct COLR_BaseGlyphRecord),
colr_compare_gid);
if (!record) {
ret->layer = 0;
ret->first_layer = 0;
ret->num_layers = 0;
ret->glyph = glyph;
ret->palette_index = 0xffff;
memset(ret, 0, sizeof(*ret));
ret->glyph = glyph;
ret->palette_index = 0xffff;
header = table_read_ensure(colr, 0, sizeof(*header));
if (!header)
return S_FALSE;
num_baseglyph_records = GET_BE_WORD(header->num_baseglyph_records);
offset_baseglyph_records = GET_BE_DWORD(header->offset_baseglyph_records);
if (!table_read_ensure(colr, offset_baseglyph_records, num_baseglyph_records * sizeof(*record)))
{
return S_FALSE;
}
ret->layer = 0;
ret->first_layer = GET_BE_WORD(record->firstLayerIndex);
ret->num_layers = GET_BE_WORD(record->numLayers);
record = bsearch(&glyph, colr->data + offset_baseglyph_records, num_baseglyph_records,
sizeof(*record), colr_compare_gid);
if (!record)
return S_FALSE;
layer = (struct COLR_LayerRecord*)((BYTE*)colr + layerrecordoffset) + ret->first_layer + ret->layer;
ret->glyph = GET_BE_WORD(layer->GID);
ret->palette_index = GET_BE_WORD(layer->paletteIndex);
ret->first_layer = GET_BE_WORD(record->first_layer_index);
ret->num_layers = GET_BE_WORD(record->num_layers);
if ((layer = table_read_ensure(colr, GET_BE_DWORD(header->offset_layer_records),
(ret->first_layer + ret->layer) * sizeof(*layer))))
{
layer += ret->first_layer + ret->layer;
ret->glyph = GET_BE_WORD(layer->glyph);
ret->palette_index = GET_BE_WORD(layer->palette_index);
}
return S_OK;
}
void opentype_colr_next_glyph(const void *colr, struct dwrite_colorglyph *glyph)
void opentype_colr_next_glyph(const struct dwrite_fonttable *colr, struct dwrite_colorglyph *glyph)
{
const struct COLR_Header *header = colr;
const struct COLR_LayerRecord *layer;
DWORD layerrecordoffset = GET_BE_DWORD(header->offsetLayerRecord);
const struct colr_layer_record *layer;
const struct colr_header *header;
/* iterated all the way through */
if (glyph->layer == glyph->num_layers)
return;
if (!(header = table_read_ensure(colr, 0, sizeof(*header))))
return;
glyph->layer++;
layer = (struct COLR_LayerRecord*)((BYTE*)colr + layerrecordoffset) + glyph->first_layer + glyph->layer;
glyph->glyph = GET_BE_WORD(layer->GID);
glyph->palette_index = GET_BE_WORD(layer->paletteIndex);
if ((layer = table_read_ensure(colr, GET_BE_DWORD(header->offset_layer_records),
(glyph->first_layer + glyph->layer) * sizeof(*layer))))
{
layer += glyph->first_layer + glyph->layer;
glyph->glyph = GET_BE_WORD(layer->glyph);
glyph->palette_index = GET_BE_WORD(layer->palette_index);
}
}
BOOL opentype_has_vertical_variants(IDWriteFontFace4 *fontface)