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[raster, smooth] Reinstate bitmap size limits. 

This again moves outline and bitmap size checks one level up.

* src/base/ftoutln.c (FT_Outline_Render): Explicitly reject enormous
outlines.
* src/raster/ftrend1.c (ft_raster1_render): Reject enormous bitmaps
and, therefore, outlines that require them.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Ditto.

* src/raster/ftraster.c (ft_black_render): Remove outline size checks.
* src/smooth/ftgrays.c (gray_raster_render): Ditto.
[STANDALONE]: Remove `FT_Outline_Get_CBox' copy.
This commit is contained in:
Alexei Podtelezhnikov 2018-08-09 22:18:00 -04:00
parent 6a97c95800
commit e16bfbec4c
6 changed files with 47 additions and 129 deletions
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16
ChangeLog
View File

@ -1,3 +1,19 @@
2018-08-09 Alexei Podtelezhnikov <apodtele@gmail.com>
[raster, smooth] Reinstate bitmap size limits.
This again moves outline and bitmap size checks one level up.
* src/base/ftoutln.c (FT_Outline_Render): Explicitly reject enormous
outlines.
* src/raster/ftrend1.c (ft_raster1_render): Reject enormous bitmaps
and, therefore, outlines that require them.
* src/smooth/ftsmooth.c (ft_smooth_render_generic): Ditto.
* src/raster/ftraster.c (ft_black_render): Remove outline size checks.
* src/smooth/ftgrays.c (gray_raster_render): Ditto.
[STANDALONE]: Remove `FT_Outline_Get_CBox' copy.
2018-08-08 Alexei Podtelezhnikov <apodtele@gmail.com>
[pcf] Revert massive unsigning.

6
src/base/ftoutln.c
View File

@ -619,6 +619,7 @@
FT_Error error;
FT_Renderer renderer;
FT_ListNode node;
FT_BBox cbox;
if ( !library )
@ -630,6 +631,11 @@
if ( !params )
return FT_THROW( Invalid_Argument );
FT_Outline_Get_CBox( outline, &cbox );
if ( cbox.xMin < -0x1000000L || cbox.yMin < -0x1000000L ||
cbox.xMax > 0x1000000L || cbox.yMax > 0x1000000L )
return FT_THROW( Invalid_Outline );
renderer = library->cur_renderer;
node = library->renderers.head;

19
src/raster/ftraster.c
View File

@ -3251,7 +3251,6 @@
{
const FT_Outline* outline = (const FT_Outline*)params->source;
const FT_Bitmap* target_map = params->target;
FT_BBox cbox;
black_TWorker worker[1];
@ -3292,24 +3291,6 @@
if ( !target_map->buffer )
return FT_THROW( Invalid );
FT_Outline_Get_CBox( outline, &cbox );
/* reject too large outline coordinates */
if ( cbox.xMin < -0x1000000L || cbox.xMax > 0x1000000L ||
cbox.yMin < -0x1000000L || cbox.yMax > 0x1000000L )
return FT_THROW( Invalid );
/* truncate the bounding box to integer pixels */
cbox.xMin = cbox.xMin >> 6;
cbox.yMin = cbox.yMin >> 6;
cbox.xMax = ( cbox.xMax + 63 ) >> 6;
cbox.yMax = ( cbox.yMax + 63 ) >> 6;
/* reject too large glyphs */
if ( cbox.xMax - cbox.xMin > 0xFFFF ||
cbox.yMax - cbox.yMin > 0xFFFF )
return FT_THROW( Invalid );
ras.outline = *outline;
ras.target = *target_map;

8
src/raster/ftrend1.c
View File

@ -129,6 +129,14 @@
ft_glyphslot_preset_bitmap( slot, mode, origin );
if ( bitmap->width > 0x7FFF || bitmap->rows > 0x7FFF )
{
FT_ERROR(( "ft_raster1_render: glyph is too large: %u x %u\n",
bitmap->width, bitmap->rows ));
error = FT_THROW( Raster_Overflow );
goto Exit;
}
/* allocate new one */
if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
goto Exit;

119
src/smooth/ftgrays.c
View File

@ -1611,83 +1611,6 @@ typedef ptrdiff_t FT_PtrDist;
return FT_THROW( Invalid_Outline );
}
/**************************************************************************
*
* @Function:
* FT_Outline_Get_CBox
*
* @Description:
* Return an outline's `control box'. The control box encloses all
* the outline's points, including Bézier control points. Though it
* coincides with the exact bounding box for most glyphs, it can be
* slightly larger in some situations (like when rotating an outline
* that contains Bézier outside arcs).
*
* Computing the control box is very fast, while getting the bounding
* box can take much more time as it needs to walk over all segments
* and arcs in the outline. To get the latter, you can use the
* `ftbbox' component, which is dedicated to this single task.
*
* @Input:
* outline ::
* A pointer to the source outline descriptor.
*
* @Output:
* acbox ::
* The outline's control box.
*
* @Note:
* See @FT_Glyph_Get_CBox for a discussion of tricky fonts.
*/
static void
FT_Outline_Get_CBox( const FT_Outline* outline,
FT_BBox *acbox )
{
TPos xMin, yMin, xMax, yMax;
if ( outline && acbox )
{
if ( outline->n_points == 0 )
{
xMin = 0;
yMin = 0;
xMax = 0;
yMax = 0;
}
else
{
FT_Vector* vec = outline->points;
FT_Vector* limit = vec + outline->n_points;
xMin = xMax = vec->x;
yMin = yMax = vec->y;
vec++;
for ( ; vec < limit; vec++ )
{
TPos x, y;
x = vec->x;
if ( x < xMin ) xMin = x;
if ( x > xMax ) xMax = x;
y = vec->y;
if ( y < yMin ) yMin = y;
if ( y > yMax ) yMax = y;
}
}
acbox->xMin = xMin;
acbox->xMax = xMax;
acbox->yMin = yMin;
acbox->yMax = yMax;
}
}
#endif /* STANDALONE_ */
@ -1832,7 +1755,7 @@ typedef ptrdiff_t FT_PtrDist;
{
const FT_Outline* outline = (const FT_Outline*)params->source;
const FT_Bitmap* target_map = params->target;
FT_BBox cbox, clip;
FT_BBox clip;
#ifndef FT_STATIC_RASTER
gray_TWorker worker[1];
@ -1895,26 +1818,11 @@ typedef ptrdiff_t FT_PtrDist;
ras.render_span_data = NULL;
}
FT_Outline_Get_CBox( outline, &cbox );
/* reject too large outline coordinates */
if ( cbox.xMin < -0x1000000L || cbox.xMax > 0x1000000L ||
cbox.yMin < -0x1000000L || cbox.yMax > 0x1000000L )
return FT_THROW( Invalid_Outline );
/* truncate the bounding box to integer pixels */
cbox.xMin = cbox.xMin >> 6;
cbox.yMin = cbox.yMin >> 6;
cbox.xMax = ( cbox.xMax + 63 ) >> 6;
cbox.yMax = ( cbox.yMax + 63 ) >> 6;
/* reject too large glyphs */
if ( cbox.xMax - cbox.xMin > 0xFFFF ||
cbox.yMax - cbox.yMin > 0xFFFF )
return FT_THROW( Invalid_Outline );
/* compute clipping box */
if ( !( params->flags & FT_RASTER_FLAG_DIRECT ) )
if ( params->flags & FT_RASTER_FLAG_DIRECT &&
params->flags & FT_RASTER_FLAG_CLIP )
clip = params->clip_box;
else
{
/* compute clip box from target pixmap */
clip.xMin = 0;
@ -1922,21 +1830,12 @@ typedef ptrdiff_t FT_PtrDist;
clip.xMax = (FT_Pos)target_map->width;
clip.yMax = (FT_Pos)target_map->rows;
}
else if ( params->flags & FT_RASTER_FLAG_CLIP )
clip = params->clip_box;
else
{
clip.xMin = -32768L;
clip.yMin = -32768L;
clip.xMax = 32767L;
clip.yMax = 32767L;
}
/* clip to target bitmap, exit if nothing to do */
ras.min_ex = FT_MAX( cbox.xMin, clip.xMin );
ras.min_ey = FT_MAX( cbox.yMin, clip.yMin );
ras.max_ex = FT_MIN( cbox.xMax, clip.xMax );
ras.max_ey = FT_MIN( cbox.yMax, clip.yMax );
ras.min_ex = clip.xMin;
ras.min_ey = clip.yMin;
ras.max_ex = clip.xMax;
ras.max_ey = clip.yMax;
if ( ras.max_ex <= ras.min_ex || ras.max_ey <= ras.min_ey )
return 0;

8
src/smooth/ftsmooth.c
View File

@ -147,6 +147,14 @@
ft_glyphslot_preset_bitmap( slot, mode, origin );
if ( bitmap->width > 0x7FFF || bitmap->rows > 0x7FFF )
{
FT_ERROR(( "ft_smooth_render_generic: glyph is too large: %u x %u\n",
bitmap->width, bitmap->rows ));
error = FT_THROW( Raster_Overflow );
goto Exit;
}
/* allocate new one */
if ( FT_ALLOC_MULT( bitmap->buffer, bitmap->rows, bitmap->pitch ) )
goto Exit;