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Fix some bugs found by clang's `-fsanitize=undefined' (#45661). 

* src/base/ftrfork.c (FT_Raccess_Get_HeaderInfo): Only accept
positive values from header.
Check overflow.

* src/base/ftoutln.c (SCALED): Correctly handle left-shift of
negative values.

* src/bdf/bdf.h (_bdf_glyph_modified, _bdf_set_glyph_modified,
_bdf_clear_glyph_modified): Use unsigned long constant.

* src/bdf/bdfdrivr.c (BDF_Size_Select, BDF_Glyph_Load): Don't
left-shift values that can be negative.

* src/pcf/pcfdrivr.c (PCF_Size_Select, PCF_Glyph_Load): Don't
left-shift values that can be negative.

* src/raster/ftraster.c (SCALED): Correctly handle left-shift of
negative values.

* src/sfnt/ttsbit.c (tt_face_load_strike_metrics): Don't left-shift
values that can be negative.

* src/truetype/ttgload.c (TT_Load_Composite_Glyph,
compute_glyph_metrics, load_sbit_image): Don't left-shift values
that can be negative.
This commit is contained in:
Werner Lemberg 2015-08-01 07:53:48 +02:00
parent 5d1b8ab4d0
commit 6343ba22a3
9 changed files with 104 additions and 60 deletions
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30
ChangeLog
View File

@ -1,3 +1,33 @@
2015-07-31 Werner Lemberg <wl@gnu.org>
Fix some bugs found by clang's `-fsanitize=undefined' (#45661).
* src/base/ftrfork.c (FT_Raccess_Get_HeaderInfo): Only accept
positive values from header.
Check overflow.
* src/base/ftoutln.c (SCALED): Correctly handle left-shift of
negative values.
* src/bdf/bdf.h (_bdf_glyph_modified, _bdf_set_glyph_modified,
_bdf_clear_glyph_modified): Use unsigned long constant.
* src/bdf/bdfdrivr.c (BDF_Size_Select, BDF_Glyph_Load): Don't
left-shift values that can be negative.
* src/pcf/pcfdrivr.c (PCF_Size_Select, PCF_Glyph_Load): Don't
left-shift values that can be negative.
* src/raster/ftraster.c (SCALED): Correctly handle left-shift of
negative values.
* src/sfnt/ttsbit.c (tt_face_load_strike_metrics): Don't left-shift
values that can be negative.
* src/truetype/ttgload.c (TT_Load_Composite_Glyph,
compute_glyph_metrics, load_sbit_image): Don't left-shift values
that can be negative.
2015-07-31 Werner Lemberg <wl@gnu.org>
Define FT_LONG_MAX.

5
src/base/ftoutln.c
View File

@ -52,8 +52,9 @@
const FT_Outline_Funcs* func_interface,
void* user )
{
#undef SCALED
#define SCALED( x ) ( ( (x) << shift ) - delta )
#undef SCALED
#define SCALED( x ) ( ( (x) < 0 ? -( -(x) << shift ) \
: ( (x) << shift ) ) - delta )
FT_Vector v_last;
FT_Vector v_control;

37
src/base/ftrfork.c
View File

@ -71,24 +71,35 @@
if ( error )
return error;
*rdata_pos = rfork_offset + ( ( head[0] << 24 ) |
( head[1] << 16 ) |
( head[2] << 8 ) |
head[3] );
map_pos = rfork_offset + ( ( head[4] << 24 ) |
( head[5] << 16 ) |
( head[6] << 8 ) |
head[7] );
rdata_len = ( head[ 8] << 24 ) |
( head[ 9] << 16 ) |
( head[10] << 8 ) |
head[11];
/* ensure positive values */
if ( head[0] >= 0x80 || head[4] >= 0x80 || head[8] >= 0x80 )
return FT_THROW( Unknown_File_Format );
*rdata_pos = ( head[ 0] << 24 ) |
( head[ 1] << 16 ) |
( head[ 2] << 8 ) |
head[ 3];
map_pos = ( head[ 4] << 24 ) |
( head[ 5] << 16 ) |
( head[ 6] << 8 ) |
head[ 7];
rdata_len = ( head[ 8] << 24 ) |
( head[ 9] << 16 ) |
( head[10] << 8 ) |
head[11];
/* map_len = head[12] .. head[15] */
if ( *rdata_pos + rdata_len != map_pos || map_pos == rfork_offset )
if ( *rdata_pos != map_pos - rdata_len || map_pos == 0 )
return FT_THROW( Unknown_File_Format );
if ( FT_LONG_MAX - rfork_offset > *rdata_pos ||
FT_LONG_MAX - rfork_offset > map_pos )
return FT_THROW( Unknown_File_Format );
*rdata_pos += rfork_offset;
map_pos += rfork_offset;
error = FT_Stream_Seek( stream, (FT_ULong)map_pos );
if ( error )
return error;

12
src/bdf/bdf.h
View File

@ -40,12 +40,12 @@ FT_BEGIN_HEADER
/* Imported from bdfP.h */
#define _bdf_glyph_modified( map, e ) \
( (map)[(e) >> 5] & ( 1 << ( (e) & 31 ) ) )
#define _bdf_set_glyph_modified( map, e ) \
( (map)[(e) >> 5] |= ( 1 << ( (e) & 31 ) ) )
#define _bdf_clear_glyph_modified( map, e ) \
( (map)[(e) >> 5] &= ~( 1 << ( (e) & 31 ) ) )
#define _bdf_glyph_modified( map, e ) \
( (map)[(e) >> 5] & ( 1UL << ( (e) & 31 ) ) )
#define _bdf_set_glyph_modified( map, e ) \
( (map)[(e) >> 5] |= ( 1UL << ( (e) & 31 ) ) )
#define _bdf_clear_glyph_modified( map, e ) \
( (map)[(e) >> 5] &= ~( 1UL << ( (e) & 31 ) ) )
/* end of bdfP.h */

18
src/bdf/bdfdrivr.c
View File

@ -615,9 +615,9 @@ THE SOFTWARE.
FT_Select_Metrics( size->face, strike_index );
size->metrics.ascender = bdffont->font_ascent << 6;
size->metrics.descender = -bdffont->font_descent << 6;
size->metrics.max_advance = bdffont->bbx.width << 6;
size->metrics.ascender = bdffont->font_ascent * 64;
size->metrics.descender = -bdffont->font_descent * 64;
size->metrics.max_advance = bdffont->bbx.width * 64;
return FT_Err_Ok;
}
@ -734,18 +734,18 @@ THE SOFTWARE.
slot->bitmap_left = glyph.bbx.x_offset;
slot->bitmap_top = glyph.bbx.ascent;
slot->metrics.horiAdvance = (FT_Pos)( glyph.dwidth << 6 );
slot->metrics.horiBearingX = (FT_Pos)( glyph.bbx.x_offset << 6 );
slot->metrics.horiBearingY = (FT_Pos)( glyph.bbx.ascent << 6 );
slot->metrics.width = (FT_Pos)( bitmap->width << 6 );
slot->metrics.height = (FT_Pos)( bitmap->rows << 6 );
slot->metrics.horiAdvance = (FT_Pos)( glyph.dwidth * 64 );
slot->metrics.horiBearingX = (FT_Pos)( glyph.bbx.x_offset * 64 );
slot->metrics.horiBearingY = (FT_Pos)( glyph.bbx.ascent * 64 );
slot->metrics.width = (FT_Pos)( bitmap->width * 64 );
slot->metrics.height = (FT_Pos)( bitmap->rows * 64 );
/*
* XXX DWIDTH1 and VVECTOR should be parsed and
* used here, provided such fonts do exist.
*/
ft_synthesize_vertical_metrics( &slot->metrics,
bdf->bdffont->bbx.height << 6 );
bdf->bdffont->bbx.height * 64 );
Exit:
return error;

18
src/pcf/pcfdrivr.c
View File

@ -430,9 +430,9 @@ THE SOFTWARE.
FT_Select_Metrics( size->face, strike_index );
size->metrics.ascender = accel->fontAscent << 6;
size->metrics.descender = -accel->fontDescent << 6;
size->metrics.max_advance = accel->maxbounds.characterWidth << 6;
size->metrics.ascender = accel->fontAscent * 64;
size->metrics.descender = -accel->fontDescent * 64;
size->metrics.max_advance = accel->maxbounds.characterWidth * 64;
return FT_Err_Ok;
}
@ -583,16 +583,16 @@ THE SOFTWARE.
slot->bitmap_left = metric->leftSideBearing;
slot->bitmap_top = metric->ascent;
slot->metrics.horiAdvance = (FT_Pos)( metric->characterWidth << 6 );
slot->metrics.horiBearingX = (FT_Pos)( metric->leftSideBearing << 6 );
slot->metrics.horiBearingY = (FT_Pos)( metric->ascent << 6 );
slot->metrics.horiAdvance = (FT_Pos)( metric->characterWidth * 64 );
slot->metrics.horiBearingX = (FT_Pos)( metric->leftSideBearing * 64 );
slot->metrics.horiBearingY = (FT_Pos)( metric->ascent * 64 );
slot->metrics.width = (FT_Pos)( ( metric->rightSideBearing -
metric->leftSideBearing ) << 6 );
slot->metrics.height = (FT_Pos)( bitmap->rows << 6 );
metric->leftSideBearing ) * 64 );
slot->metrics.height = (FT_Pos)( bitmap->rows * 64 );
ft_synthesize_vertical_metrics( &slot->metrics,
( face->accel.fontAscent +
face->accel.fontDescent ) << 6 );
face->accel.fontDescent ) * 64 );
Exit:
return error;

4
src/raster/ftraster.c
View File

@ -450,7 +450,9 @@
#define CEILING( x ) ( ( (x) + ras.precision - 1 ) & -ras.precision )
#define TRUNC( x ) ( (Long)(x) >> ras.precision_bits )
#define FRAC( x ) ( (x) & ( ras.precision - 1 ) )
#define SCALED( x ) ( ( (Long)(x) << ras.scale_shift ) - ras.precision_half )
#define SCALED( x ) ( ( (x) < 0 ? -( -(x) << ras.scale_shift ) \
: ( (x) << ras.scale_shift ) ) \
- ras.precision_half )
#define IS_BOTTOM_OVERSHOOT( x ) \
(Bool)( CEILING( x ) - x >= ras.precision_half )

6
src/sfnt/ttsbit.c
View File

@ -254,15 +254,15 @@
metrics->x_ppem = (FT_UShort)strike[44];
metrics->y_ppem = (FT_UShort)strike[45];
metrics->ascender = (FT_Char)strike[16] << 6; /* hori.ascender */
metrics->descender = (FT_Char)strike[17] << 6; /* hori.descender */
metrics->ascender = (FT_Char)strike[16] * 64; /* hori.ascender */
metrics->descender = (FT_Char)strike[17] * 64; /* hori.descender */
metrics->height = metrics->ascender - metrics->descender;
/* Is this correct? */
metrics->max_advance = ( (FT_Char)strike[22] + /* min_origin_SB */
strike[18] + /* max_width */
(FT_Char)strike[23] /* min_advance_SB */
) << 6;
) * 64;
return FT_Err_Ok;
}

34
src/truetype/ttgload.c
View File

@ -656,20 +656,20 @@
if ( subglyph->flags & WE_HAVE_A_SCALE )
{
xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
yy = xx;
}
else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
{
xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
}
else if ( subglyph->flags & WE_HAVE_A_2X2 )
{
xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
xx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
yx = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
xy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
yy = (FT_Fixed)FT_NEXT_SHORT( p ) * 4;
}
subglyph->transform.xx = xx;
@ -1988,7 +1988,7 @@
( ( ignore_x_mode && loader->exec->compatible_widths ) ||
!ignore_x_mode ||
SPH_OPTION_BITMAP_WIDTHS ) )
glyph->metrics.horiAdvance = *widthp << 6;
glyph->metrics.horiAdvance = *widthp * 64;
}
else
@ -1996,7 +1996,7 @@
{
if ( widthp )
glyph->metrics.horiAdvance = *widthp << 6;
glyph->metrics.horiAdvance = *widthp * 64;
}
}
@ -2136,16 +2136,16 @@
glyph->outline.n_points = 0;
glyph->outline.n_contours = 0;
glyph->metrics.width = (FT_Pos)metrics.width << 6;
glyph->metrics.height = (FT_Pos)metrics.height << 6;
glyph->metrics.width = (FT_Pos)metrics.width * 64;
glyph->metrics.height = (FT_Pos)metrics.height * 64;
glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;
glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;
glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6;
glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX * 64;
glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY * 64;
glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance * 64;
glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;
glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;
glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6;
glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX * 64;
glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY * 64;
glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance * 64;
glyph->format = FT_GLYPH_FORMAT_BITMAP;