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[cff] Fix integer overflows. 

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2027
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2028

* src/cff/cf2hints.c (cf2_hintmap_insertHint), src/cff/cf2intrp.c
(cf2_doFlex): Use OVERFLOW_ADD_INT32 and OVERFLOW_SUB_INT32.
This commit is contained in:
Werner Lemberg 2017-06-02 08:44:20 +02:00
parent cd02d359a6
commit 3802ca8b64
3 changed files with 27 additions and 10 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2017-06-02 Werner Lemberg <wl@gnu.org>
[cff] Fix integer overflows.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2027
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2028
* src/cff/cf2hints.c (cf2_hintmap_insertHint), src/cff/cf2intrp.c
(cf2_doFlex): Use OVERFLOW_ADD_INT32 and OVERFLOW_SUB_INT32.
2017-06-01 Werner Lemberg <wl@gnu.org>
[smooth] Some 32bit integer overflow run-time errors.

18
src/cff/cf2hints.c
View File

@ -638,14 +638,16 @@
{
/* Use hint map to position the center of stem, and nominal scale */
/* to position the two edges. This preserves the stem width. */
CF2_Fixed midpoint = cf2_hintmap_map(
hintmap->initialHintMap,
( secondHintEdge->csCoord +
firstHintEdge->csCoord ) / 2 );
CF2_Fixed halfWidth = FT_MulFix(
( secondHintEdge->csCoord -
firstHintEdge->csCoord ) / 2,
hintmap->scale );
CF2_Fixed midpoint =
cf2_hintmap_map(
hintmap->initialHintMap,
OVERFLOW_ADD_INT32( secondHintEdge->csCoord,
firstHintEdge->csCoord ) / 2 );
CF2_Fixed halfWidth =
FT_MulFix(
OVERFLOW_SUB_INT32( secondHintEdge->csCoord,
firstHintEdge->csCoord ) / 2,
hintmap->scale );
firstHintEdge->dsCoord = midpoint - halfWidth;

7
src/cff/cf2intrp.c
View File

@ -358,8 +358,11 @@
if ( doConditionalLastRead )
{
FT_Bool lastIsX = (FT_Bool)( cf2_fixedAbs( vals[10] - *curX ) >
cf2_fixedAbs( vals[11] - *curY ) );
FT_Bool lastIsX = (FT_Bool)(
cf2_fixedAbs( OVERFLOW_SUB_INT32( vals[10],
*curX ) ) >
cf2_fixedAbs( OVERFLOW_SUB_INT32( vals[11],
*curY ) ) );
CF2_Fixed lastVal = cf2_stack_getReal( opStack, idx );