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[cff, truetype] Integer overflows. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2216
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2218

* src/cff/cf2fixed.h (cf2_fixedAbs): Use NEG_INT32.

* src/truetype/ttinterp.c (Ins_IP): Use SUB_LONG.
This commit is contained in:
Werner Lemberg 2017-06-13 06:56:48 +02:00
parent 3ed3a96181
commit 5c402d97af
3 changed files with 23 additions and 6 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2017-06-13 Werner Lemberg <wl@gnu.org>
[cff, truetype] Integer overflows.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2216
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2218
* src/cff/cf2fixed.h (cf2_fixedAbs): Use NEG_INT32.
* src/truetype/ttinterp.c (Ins_IP): Use SUB_LONG.
2017-06-11 Werner Lemberg <wl@gnu.org>
[cff] Integer overflows.

2
src/cff/cf2fixed.h
View File

@ -66,7 +66,7 @@ FT_BEGIN_HEADER
#define cf2_doubleToFixed( f ) \
( (CF2_Fixed)( (f) * 65536.0 + 0.5 ) )
#define cf2_fixedAbs( x ) \
( (x) < 0 ? -(x) : (x) )
( (x) < 0 ? NEG_INT32( x ) : (x) )
#define cf2_fixedFloor( x ) \
( (CF2_Fixed)( (FT_UInt32)(x) & 0xFFFF0000UL ) )
#define cf2_fixedFraction( x ) \

14
src/truetype/ttinterp.c
View File

@ -6627,9 +6627,11 @@
FT_Vector vec;
vec.x = FT_MulFix( exc->zp1.orus[exc->GS.rp2].x - orus_base->x,
vec.x = FT_MulFix( SUB_LONG( exc->zp1.orus[exc->GS.rp2].x,
orus_base->x ),
exc->metrics.x_scale );
vec.y = FT_MulFix( exc->zp1.orus[exc->GS.rp2].y - orus_base->y,
vec.y = FT_MulFix( SUB_LONG( exc->zp1.orus[exc->GS.rp2].y,
orus_base->y ),
exc->metrics.y_scale );
old_range = FAST_DUALPROJ( &vec );
@ -6664,9 +6666,11 @@
FT_Vector vec;
vec.x = FT_MulFix( exc->zp2.orus[point].x - orus_base->x,
vec.x = FT_MulFix( SUB_LONG( exc->zp2.orus[point].x,
orus_base->x ),
exc->metrics.x_scale );
vec.y = FT_MulFix( exc->zp2.orus[point].y - orus_base->y,
vec.y = FT_MulFix( SUB_LONG( exc->zp2.orus[point].y,
orus_base->y ),
exc->metrics.y_scale );
org_dist = FAST_DUALPROJ( &vec );
@ -6705,7 +6709,7 @@
exc->func_move( exc,
&exc->zp2,
(FT_UShort)point,
new_dist - cur_dist );
SUB_LONG( new_dist, cur_dist ) );
}
Fail: