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[pcf] 32bit integer overflow run-time errors (#46149). 

* src/pcf/pcfread.c (pcf_get_accel): Add sanity checks for
`fontAscent' and `fontDescent'.
(pcf_load_font): Add sanity checks for global height.
Add sanity checks for AVERAGE_WIDTH, POINT_SIZE, PIXEL_SIZE,
RESOLUTION_X, and RESOLUTION_Y properties.
This commit is contained in:
Werner Lemberg 2017-05-29 21:04:27 +02:00
parent fbe2fe4c75
commit f01463297f
2 changed files with 79 additions and 9 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
2017-05-29 Werner Lemberg <wl@gnu.org>
[pcf] 32bit integer overflow run-time errors (#46149).
* src/pcf/pcfread.c (pcf_get_accel): Add sanity checks for
`fontAscent' and `fontDescent'.
(pcf_load_font): Add sanity checks for global height.
Add sanity checks for AVERAGE_WIDTH, POINT_SIZE, PIXEL_SIZE,
RESOLUTION_X, and RESOLUTION_Y properties.
2017-05-29 Werner Lemberg <wl@gnu.org>
Handle some integer overflow run-time errors (#46149, #48979).

78
src/pcf/pcfread.c
View File

@ -1162,6 +1162,20 @@ THE SOFTWARE.
accel->fontDescent,
accel->maxOverlap ));
/* sanity checks */
if ( FT_ABS( accel->fontAscent ) > 0x7FFF )
{
accel->fontAscent = accel->fontAscent < 0 ? -0x7FFF : 0x7FFF;
FT_TRACE0(( "pfc_get_accel: clamping font ascent to value %d\n",
accel->fontAscent ));
}
if ( FT_ABS( accel->fontDescent ) > 0x7FFF )
{
accel->fontDescent = accel->fontDescent < 0 ? -0x7FFF : 0x7FFF;
FT_TRACE0(( "pfc_get_accel: clamping font descent to value %d\n",
accel->fontDescent ));
}
FT_TRACE5(( " minbounds:" ));
error = pcf_get_metric( stream,
format & ( ~PCF_FORMAT_MASK ),
@ -1496,8 +1510,16 @@ THE SOFTWARE.
if ( face->accel.fontAscent + face->accel.fontDescent < 0 )
FT_TRACE0(( "pcf_load_font: negative height\n" ));
#endif
bsize->height = FT_ABS( (FT_Short)( face->accel.fontAscent +
face->accel.fontDescent ) );
if ( FT_ABS( face->accel.fontAscent +
face->accel.fontDescent ) > 0x7FFF )
{
bsize->height = 0x7FFF;
FT_TRACE0(( "pcf_load_font: clamping height to value %d\n",
bsize->height ));
}
else
bsize->height = FT_ABS( (FT_Short)( face->accel.fontAscent +
face->accel.fontDescent ) );
prop = pcf_find_property( face, "AVERAGE_WIDTH" );
if ( prop )
@ -1506,10 +1528,20 @@ THE SOFTWARE.
if ( prop->value.l < 0 )
FT_TRACE0(( "pcf_load_font: negative average width\n" ));
#endif
bsize->width = FT_ABS( (FT_Short)( ( prop->value.l ) + 5 ) / 10 );
if ( ( FT_ABS( prop->value.l ) > 0x7FFFL * 10 - 5 ) )
{
bsize->width = 0x7FFF;
FT_TRACE0(( "pcf_load_font: clamping average width to value %d\n",
bsize->width ));
}
else
bsize->width = FT_ABS( (FT_Short)( ( prop->value.l + 5 ) / 10 ) );
}
else
{
/* this is a heuristical value */
bsize->width = (FT_Short)FT_MulDiv( bsize->height, 2, 3 );
}
prop = pcf_find_property( face, "POINT_SIZE" );
if ( prop )
@ -1519,9 +1551,16 @@ THE SOFTWARE.
FT_TRACE0(( "pcf_load_font: negative point size\n" ));
#endif
/* convert from 722.7 decipoints to 72 points per inch */
bsize->size = FT_MulDiv( FT_ABS( prop->value.l ),
64 * 7200,
72270L );
if ( FT_ABS( prop->value.l ) > 0x504C2L ) /* 0x7FFF * 72270/7200 */
{
bsize->size = 0x7FFF;
FT_TRACE0(( "pcf_load_font: clamping point size to value %d\n",
bsize->size ));
}
else
bsize->size = FT_MulDiv( FT_ABS( prop->value.l ),
64 * 7200,
72270L );
}
prop = pcf_find_property( face, "PIXEL_SIZE" );
@ -1531,7 +1570,14 @@ THE SOFTWARE.
if ( prop->value.l < 0 )
FT_TRACE0(( "pcf_load_font: negative pixel size\n" ));
#endif
bsize->y_ppem = FT_ABS( (FT_Short)prop->value.l ) << 6;
if ( FT_ABS( prop->value.l ) > 0x7FFF )
{
bsize->y_ppem = 0x7FFF << 6;
FT_TRACE0(( "pcf_load_font: clamping pixel size to value %d\n",
bsize->y_ppem ));
}
else
bsize->y_ppem = FT_ABS( (FT_Short)prop->value.l ) << 6;
}
prop = pcf_find_property( face, "RESOLUTION_X" );
@ -1541,7 +1587,14 @@ THE SOFTWARE.
if ( prop->value.l < 0 )
FT_TRACE0(( "pcf_load_font: negative X resolution\n" ));
#endif
resolution_x = FT_ABS( (FT_Short)prop->value.l );
if ( FT_ABS( prop->value.l ) > 0x7FFF )
{
resolution_x = 0x7FFF;
FT_TRACE0(( "pcf_load_font: clamping X resolution to value %d\n",
resolution_x ));
}
else
resolution_x = FT_ABS( (FT_Short)prop->value.l );
}
prop = pcf_find_property( face, "RESOLUTION_Y" );
@ -1551,7 +1604,14 @@ THE SOFTWARE.
if ( prop->value.l < 0 )
FT_TRACE0(( "pcf_load_font: negative Y resolution\n" ));
#endif
resolution_y = FT_ABS( (FT_Short)prop->value.l );
if ( FT_ABS( prop->value.l ) > 0x7FFF )
{
resolution_y = 0x7FFF;
FT_TRACE0(( "pcf_load_font: clamping Y resolution to value %d\n",
resolution_y ));
}
else
resolution_y = FT_ABS( (FT_Short)prop->value.l );
}
if ( bsize->y_ppem == 0 )