ref: 4dc00cf5c045074c5a324a1c87d166ba1ad728c3
parent: dbeb7bce7f76cdd786ce4022e0b45a653f68db5d
author: Werner Lemberg <[email protected]>
date: Fri Jun 16 09:33:09 EDT 2017
[truetype] Integer overflows. Reported as https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2270 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2278 * src/truetype/ttinterp.c (Ins_MDRP, _iup_worker_interpolate): Use ADD_LONG and SUB_LONG.
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+2017-06-16 Werner Lemberg <[email protected]>
+
+ [truetype] Integer overflows.
+
+ Reported as
+
+ https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2270
+ https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2278
+
+ * src/truetype/ttinterp.c (Ins_MDRP, _iup_worker_interpolate): Use
+ ADD_LONG and SUB_LONG.
+
2017-06-15 Werner Lemberg <[email protected]>
[bdf, cff] Integer overflows.
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -6062,8 +6062,10 @@
FT_Vector vec;
- vec.x = FT_MulFix( vec1->x - vec2->x, exc->metrics.x_scale );
- vec.y = FT_MulFix( vec1->y - vec2->y, exc->metrics.y_scale );
+ vec.x = FT_MulFix( SUB_LONG( vec1->x, vec2->x ),
+ exc->metrics.x_scale );
+ vec.y = FT_MulFix( SUB_LONG( vec1->y, vec2->y ),
+ exc->metrics.y_scale );
org_dist = FAST_DUALPROJ( &vec );
}
@@ -6125,7 +6127,7 @@
org_dist = PROJECT( exc->zp1.cur + point, exc->zp0.cur + exc->GS.rp0 );
- exc->func_move( exc, &exc->zp1, point, distance - org_dist );
+ exc->func_move( exc, &exc->zp1, point, SUB_LONG( distance, org_dist ) );
Fail:
exc->GS.rp1 = exc->GS.rp0;
@@ -6826,8 +6828,8 @@
org2 = worker->orgs[ref2].x;
cur1 = worker->curs[ref1].x;
cur2 = worker->curs[ref2].x;
- delta1 = cur1 - org1;
- delta2 = cur2 - org2;
+ delta1 = SUB_LONG( cur1, org1 );
+ delta2 = SUB_LONG( cur2, org2 );
if ( cur1 == cur2 || orus1 == orus2 )
{@@ -6839,10 +6841,10 @@
if ( x <= org1 )
- x += delta1;
+ x = ADD_LONG( x, delta1 );
else if ( x >= org2 )
- x += delta2;
+ x = ADD_LONG( x, delta2 );
else
x = cur1;
@@ -6863,10 +6865,10 @@
if ( x <= org1 )
- x += delta1;
+ x = ADD_LONG( x, delta1 );
else if ( x >= org2 )
- x += delta2;
+ x = ADD_LONG( x, delta2 );
else
{@@ -6873,10 +6875,13 @@
if ( !scale_valid )
{scale_valid = 1;
- scale = FT_DivFix( cur2 - cur1, orus2 - orus1 );
+ scale = FT_DivFix( SUB_LONG( cur2, cur1 ),
+ SUB_LONG( orus2, orus1 ) );
}
- x = cur1 + FT_MulFix( worker->orus[i].x - orus1, scale );
+ x = ADD_LONG( cur1,
+ FT_MulFix( SUB_LONG( worker->orus[i].x, orus1 ),
+ scale ) );
}
worker->curs[i].x = x;
}