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Code Issues 9 Releases Wiki Activity

[cff, truetype] Integer overflows. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2300
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2313

* src/cff/cf2hints.c (cf2_hintmap_adjustHints): Use ADD_INT32.

* src/truetype/ttinterp.c (Ins_ABS): Avoid FT_ABS.
This commit is contained in:
Werner Lemberg 2017-06-20 07:49:52 +02:00
parent 7b7278334c
commit 8c763fb1be
3 changed files with 34 additions and 12 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2017-06-16 Werner Lemberg <wl@gnu.org>
[cff, truetype] Integer overflows.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2300
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2313
* src/cff/cf2hints.c (cf2_hintmap_adjustHints): Use ADD_INT32.
* src/truetype/ttinterp.c (Ins_ABS): Avoid FT_ABS.
2017-06-17 Alexei Podtelezhnikov <apodtele@gmail.com>
[base, smooth] LCD filtering cleanups.

30
src/cff/cf2hints.c
View File

@ -440,14 +440,16 @@
/* is there room to move up? */
/* there is if we are at top of array or the next edge is at or */
/* beyond proposed move up? */
if ( j >= hintmap->count - 1 ||
if ( j >= hintmap->count - 1 ||
hintmap->edge[j + 1].dsCoord >=
hintmap->edge[j].dsCoord + moveUp + upMinCounter )
ADD_INT32( hintmap->edge[j].dsCoord,
moveUp + upMinCounter ) )
{
/* there is room to move up; is there also room to move down? */
if ( i == 0 ||
if ( i == 0 ||
hintmap->edge[i - 1].dsCoord <=
hintmap->edge[i].dsCoord + moveDown - downMinCounter )
ADD_INT32( hintmap->edge[i].dsCoord,
moveDown - downMinCounter ) )
{
/* move smaller absolute amount */
move = ( -moveDown < moveUp ) ? moveDown : moveUp; /* optimum */
@ -458,9 +460,10 @@
else
{
/* is there room to move down? */
if ( i == 0 ||
if ( i == 0 ||
hintmap->edge[i - 1].dsCoord <=
hintmap->edge[i].dsCoord + moveDown - downMinCounter )
ADD_INT32( hintmap->edge[i].dsCoord,
moveDown - downMinCounter ) )
{
move = moveDown;
/* true if non-optimum move */
@ -494,9 +497,11 @@
}
/* move the edge(s) */
hintmap->edge[i].dsCoord += move;
hintmap->edge[i].dsCoord = ADD_INT32( hintmap->edge[i].dsCoord,
move );
if ( isPair )
hintmap->edge[j].dsCoord += move;
hintmap->edge[j].dsCoord = ADD_INT32( hintmap->edge[j].dsCoord,
move );
}
/* assert there are no overlaps in device space */
@ -544,15 +549,18 @@
/* is there room to move up? */
if ( hintmap->edge[j + 1].dsCoord >=
hintmap->edge[j].dsCoord + hintMove->moveUp + CF2_MIN_COUNTER )
ADD_INT32( hintmap->edge[j].dsCoord,
hintMove->moveUp + CF2_MIN_COUNTER ) )
{
/* there is more room now, move edge up */
hintmap->edge[j].dsCoord += hintMove->moveUp;
hintmap->edge[j].dsCoord = ADD_INT32( hintmap->edge[j].dsCoord,
hintMove->moveUp );
if ( cf2_hint_isPair( &hintmap->edge[j] ) )
{
FT_ASSERT( j > 0 );
hintmap->edge[j - 1].dsCoord += hintMove->moveUp;
hintmap->edge[j - 1].dsCoord =
ADD_INT32( hintmap->edge[j - 1].dsCoord, hintMove->moveUp );
}
}
}

3
src/truetype/ttinterp.c
View File

@ -2914,7 +2914,8 @@
static void
Ins_ABS( FT_Long* args )
{
args[0] = FT_ABS( args[0] );
if ( args[0] < 0 )
args[0] = NEG_LONG( args[0] );
}