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dwrite: Validate 'gasp' data before accessing it. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2019-01-27 08:55:26 +03:00 committed by Alexandre Julliard
parent 2dcb3c7451
commit 471611b575
3 changed files with 50 additions and 37 deletions
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2
dlls/dwrite/dwrite_private.h
View File

@ -254,7 +254,7 @@ enum gasp_flags {
GASP_SYMMETRIC_SMOOTHING = 0x0008,
};
extern WORD opentype_get_gasp_flags(const WORD*,UINT32,INT) DECLSPEC_HIDDEN;
extern unsigned int opentype_get_gasp_flags(const struct dwrite_fonttable *gasp, float emsize) DECLSPEC_HIDDEN;
/* BiDi helpers */
extern HRESULT bidi_computelevels(const WCHAR*,UINT32,UINT8,UINT8*,UINT8*) DECLSPEC_HIDDEN;

42
dlls/dwrite/font.c
View File

@ -379,11 +379,10 @@ static const void* get_fontface_vdmx(struct dwrite_fontface *fontface)
return get_fontface_table(&fontface->IDWriteFontFace4_iface, MS_VDMX_TAG, &fontface->vdmx);
}
static const void* get_fontface_gasp(struct dwrite_fontface *fontface, UINT32 *size)
static const struct dwrite_fonttable *get_fontface_gasp(struct dwrite_fontface *fontface)
{
const void *ptr = get_fontface_table(&fontface->IDWriteFontFace4_iface, MS_GASP_TAG, &fontface->gasp);
*size = fontface->gasp.size;
return ptr;
get_fontface_table(&fontface->IDWriteFontFace4_iface, MS_GASP_TAG, &fontface->gasp);
return &fontface->gasp;
}
static const void* get_fontface_cpal(struct dwrite_fontface *fontface)
@ -687,7 +686,7 @@ static HRESULT WINAPI dwritefontface_GetGlyphRunOutline(IDWriteFontFace4 *iface,
}
static DWRITE_RENDERING_MODE fontface_renderingmode_from_measuringmode(DWRITE_MEASURING_MODE measuring,
FLOAT ppem, WORD gasp)
float ppem, unsigned int gasp)
{
DWRITE_RENDERING_MODE mode = DWRITE_RENDERING_MODE_DEFAULT;
@ -718,10 +717,8 @@ static HRESULT WINAPI dwritefontface_GetRecommendedRenderingMode(IDWriteFontFace
FLOAT ppdip, DWRITE_MEASURING_MODE measuring, IDWriteRenderingParams *params, DWRITE_RENDERING_MODE *mode)
{
struct dwrite_fontface *This = impl_from_IDWriteFontFace4(iface);
const WORD *ptr;
UINT32 size;
unsigned int flags;
FLOAT ppem;
WORD gasp;
TRACE("(%p)->(%.2f %.2f %d %p %p)\n", This, emSize, ppdip, measuring, params, mode);
@ -741,9 +738,8 @@ static HRESULT WINAPI dwritefontface_GetRecommendedRenderingMode(IDWriteFontFace
return S_OK;
}
ptr = get_fontface_gasp(This, &size);
gasp = opentype_get_gasp_flags(ptr, size, ppem);
*mode = fontface_renderingmode_from_measuringmode(measuring, ppem, gasp);
flags = opentype_get_gasp_flags(get_fontface_gasp(This), ppem);
*mode = fontface_renderingmode_from_measuringmode(measuring, ppem, flags);
return S_OK;
}
@ -1097,10 +1093,8 @@ static HRESULT WINAPI dwritefontface2_GetRecommendedRenderingMode(IDWriteFontFac
DWRITE_GRID_FIT_MODE *gridfitmode)
{
struct dwrite_fontface *This = impl_from_IDWriteFontFace4(iface);
unsigned int flags;
FLOAT emthreshold;
const WORD *ptr;
UINT32 size;
WORD gasp;
TRACE("(%p)->(%.2f %.2f %.2f %p %d %d %d %p %p %p)\n", This, emSize, dpiX, dpiY, m, is_sideways, threshold,
measuringmode, params, renderingmode, gridfitmode);
@ -1131,14 +1125,13 @@ static HRESULT WINAPI dwritefontface2_GetRecommendedRenderingMode(IDWriteFontFac
emthreshold = threshold == DWRITE_OUTLINE_THRESHOLD_ANTIALIASED ? RECOMMENDED_OUTLINE_AA_THRESHOLD : RECOMMENDED_OUTLINE_A_THRESHOLD;
ptr = get_fontface_gasp(This, &size);
gasp = opentype_get_gasp_flags(ptr, size, emSize);
flags = opentype_get_gasp_flags(get_fontface_gasp(This), emSize);
if (*renderingmode == DWRITE_RENDERING_MODE_DEFAULT) {
if (emSize >= emthreshold)
*renderingmode = DWRITE_RENDERING_MODE_OUTLINE;
else
*renderingmode = fontface_renderingmode_from_measuringmode(measuringmode, emSize, gasp);
*renderingmode = fontface_renderingmode_from_measuringmode(measuringmode, emSize, flags);
}
if (*gridfitmode == DWRITE_GRID_FIT_MODE_DEFAULT) {
@ -1147,7 +1140,8 @@ static HRESULT WINAPI dwritefontface2_GetRecommendedRenderingMode(IDWriteFontFac
else if (measuringmode == DWRITE_MEASURING_MODE_GDI_CLASSIC || measuringmode == DWRITE_MEASURING_MODE_GDI_NATURAL)
*gridfitmode = DWRITE_GRID_FIT_MODE_ENABLED;
else
*gridfitmode = (gasp & (GASP_GRIDFIT|GASP_SYMMETRIC_GRIDFIT)) ? DWRITE_GRID_FIT_MODE_ENABLED : DWRITE_GRID_FIT_MODE_DISABLED;
*gridfitmode = flags & (GASP_GRIDFIT|GASP_SYMMETRIC_GRIDFIT) ?
DWRITE_GRID_FIT_MODE_ENABLED : DWRITE_GRID_FIT_MODE_DISABLED;
}
return S_OK;
@ -1229,10 +1223,8 @@ static HRESULT WINAPI dwritefontface3_GetRecommendedRenderingMode(IDWriteFontFac
IDWriteRenderingParams *params, DWRITE_RENDERING_MODE1 *rendering_mode, DWRITE_GRID_FIT_MODE *gridfit_mode)
{
struct dwrite_fontface *This = impl_from_IDWriteFontFace4(iface);
unsigned int flags;
FLOAT emthreshold;
const WORD *ptr;
UINT32 size;
WORD gasp;
TRACE("(%p)->(%.2f %.2f %.2f %p %d %d %d %p %p %p)\n", This, emSize, dpiX, dpiY, m, is_sideways, threshold,
measuring_mode, params, rendering_mode, gridfit_mode);
@ -1263,14 +1255,13 @@ static HRESULT WINAPI dwritefontface3_GetRecommendedRenderingMode(IDWriteFontFac
emthreshold = threshold == DWRITE_OUTLINE_THRESHOLD_ANTIALIASED ? RECOMMENDED_OUTLINE_AA_THRESHOLD : RECOMMENDED_OUTLINE_A_THRESHOLD;
ptr = get_fontface_gasp(This, &size);
gasp = opentype_get_gasp_flags(ptr, size, emSize);
flags = opentype_get_gasp_flags(get_fontface_gasp(This), emSize);
if (*rendering_mode == DWRITE_RENDERING_MODE1_DEFAULT) {
if (emSize >= emthreshold)
*rendering_mode = DWRITE_RENDERING_MODE1_OUTLINE;
else
*rendering_mode = fontface_renderingmode_from_measuringmode(measuring_mode, emSize, gasp);
*rendering_mode = fontface_renderingmode_from_measuringmode(measuring_mode, emSize, flags);
}
if (*gridfit_mode == DWRITE_GRID_FIT_MODE_DEFAULT) {
@ -1279,7 +1270,8 @@ static HRESULT WINAPI dwritefontface3_GetRecommendedRenderingMode(IDWriteFontFac
else if (measuring_mode == DWRITE_MEASURING_MODE_GDI_CLASSIC || measuring_mode == DWRITE_MEASURING_MODE_GDI_NATURAL)
*gridfit_mode = DWRITE_GRID_FIT_MODE_ENABLED;
else
*gridfit_mode = (gasp & (GASP_GRIDFIT|GASP_SYMMETRIC_GRIDFIT)) ? DWRITE_GRID_FIT_MODE_ENABLED : DWRITE_GRID_FIT_MODE_DISABLED;
*gridfit_mode = flags & (GASP_GRIDFIT|GASP_SYMMETRIC_GRIDFIT) ?
DWRITE_GRID_FIT_MODE_ENABLED : DWRITE_GRID_FIT_MODE_DISABLED;
}
return S_OK;

43
dlls/dwrite/opentype.c
View File

@ -292,6 +292,20 @@ typedef struct {
BYTE bitDepth;
BYTE flags;
} CBLCBitmapSizeTable;
struct gasp_range
{
WORD max_ppem;
WORD flags;
};
struct gasp_header
{
WORD version;
WORD num_ranges;
struct gasp_range ranges[1];
};
#include "poppack.h"
enum OS2_FSSELECTION {
@ -1959,25 +1973,32 @@ BOOL opentype_get_vdmx_size(const void *data, INT emsize, UINT16 *ascent, UINT16
return FALSE;
}
WORD opentype_get_gasp_flags(const WORD *ptr, UINT32 size, INT emsize)
unsigned int opentype_get_gasp_flags(const struct dwrite_fonttable *gasp, float emsize)
{
WORD num_recs, version;
unsigned int version, num_ranges, i;
const struct gasp_header *table;
WORD flags = 0;
if (!ptr)
if (!gasp->exists)
return 0;
version = GET_BE_WORD( *ptr++ );
num_recs = GET_BE_WORD( *ptr++ );
if (version > 1 || size < (num_recs * 2 + 2) * sizeof(WORD)) {
ERR("unsupported gasp table: ver %d size %d recs %d\n", version, size, num_recs);
num_ranges = table_read_be_word(gasp, FIELD_OFFSET(struct gasp_header, num_ranges));
table = table_read_ensure(gasp, 0, FIELD_OFFSET(struct gasp_header, ranges[num_ranges]));
if (!table)
return 0;
version = GET_BE_WORD(table->version);
if (version > 1)
{
ERR("Unsupported gasp table format version %u.\n", version);
goto done;
}
while (num_recs--) {
flags = GET_BE_WORD( *(ptr + 1) );
if (emsize <= GET_BE_WORD( *ptr )) break;
ptr += 2;
for (i = 0; i < num_ranges; ++i)
{
flags = GET_BE_WORD(table->ranges[i].flags);
if (emsize <= GET_BE_WORD(table->ranges[i].max_ppem)) break;
}
done: