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[truetype] Integer overflow issues.

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Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6027

* src/truetype/ttinterp.c (Ins_MSIRP, Ins_MIAP, Ins_MIRP): Use
SUB_LONG; avoid FT_ABS.
This commit is contained in:
Werner Lemberg 2018-02-06 02:23:19 +01:00
parent f4a3255d45
commit 4a03f17449
2 changed files with 44 additions and 7 deletions
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11
ChangeLog
View File

@ -1,3 +1,14 @@
2018-02-06 Werner Lemberg <wl@gnu.org>
[truetype] Integer overflow issues.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6027
* src/truetype/ttinterp.c (Ins_MSIRP, Ins_MIAP, Ins_MIRP): Use
SUB_LONG; avoid FT_ABS.
2018-02-04 Alexei Podtelezhnikov <apodtele@gmail.com>
[unix] Use -fvisibility=hidden.

40
src/truetype/ttinterp.c
View File

@ -5782,6 +5782,7 @@
FT_F26Dot6 distance;
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
FT_F26Dot6 control_value_cutin = 0;
FT_F26Dot6 delta;
if ( SUBPIXEL_HINTING_INFINALITY )
@ -5817,11 +5818,15 @@
distance = PROJECT( exc->zp1.cur + point, exc->zp0.cur + exc->GS.rp0 );
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
delta = SUB_LONG( distance, args[1] );
if ( delta < 0 )
delta = NEG_LONG( delta );
/* subpixel hinting - make MSIRP respect CVT cut-in; */
if ( SUBPIXEL_HINTING_INFINALITY &&
exc->ignore_x_mode &&
exc->GS.freeVector.x != 0 &&
FT_ABS( SUB_LONG( distance, args[1] ) ) >= control_value_cutin )
if ( SUBPIXEL_HINTING_INFINALITY &&
exc->ignore_x_mode &&
exc->GS.freeVector.x != 0 &&
delta >= control_value_cutin )
distance = args[1];
#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */
@ -5978,7 +5983,14 @@
if ( ( exc->opcode & 1 ) != 0 ) /* rounding and control cut-in flag */
{
if ( FT_ABS( distance - org_dist ) > control_value_cutin )
FT_F26Dot6 delta;
delta = SUB_LONG( distance, org_dist );
if ( delta < 0 )
delta = NEG_LONG( delta );
if ( delta > control_value_cutin )
distance = org_dist;
#ifdef TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY
@ -6259,6 +6271,9 @@
if ( exc->GS.gep0 == exc->GS.gep1 )
{
FT_F26Dot6 delta;
/* XXX: According to Greg Hitchcock, the following wording is */
/* the right one: */
/* */
@ -6271,7 +6286,11 @@
/* `ttinst2.doc', version 1.66, is thus incorrect since */
/* it implies `>=' instead of `>'. */
if ( FT_ABS( cvt_dist - org_dist ) > control_value_cutin )
delta = SUB_LONG( cvt_dist, org_dist );
if ( delta < 0 )
delta = NEG_LONG( delta );
if ( delta > control_value_cutin )
cvt_dist = org_dist;
}
@ -6289,7 +6308,14 @@
exc->ignore_x_mode &&
exc->GS.gep0 == exc->GS.gep1 )
{
if ( FT_ABS( cvt_dist - org_dist ) > control_value_cutin )
FT_F26Dot6 delta;
delta = SUB_LONG( cvt_dist, org_dist );
if ( delta < 0 )
delta = NEG_LONG( delta );
if ( delta > control_value_cutin )
cvt_dist = org_dist;
}
#endif /* TT_SUPPORT_SUBPIXEL_HINTING_INFINALITY */