[freetype2] master 6b660f1: [psaux] Fix numeric overflow.

[Werner LEMBERG]

branch: master
commit 6b660f12151c7f333f8be6d84df916db210d3742
Author: Werner Lemberg <address@hidden>
Commit: Werner Lemberg <address@hidden>

    [psaux] Fix numeric overflow.
    
    Reported as
    
      https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10768
    
    * src/psaux/cffdecode.c (cff_decoder_parse_charstrings) <cff_op_roll>
    [CFF_CONFIG_OPTION_OLD_ENGINE]: Use NEG_INT.
---
 ChangeLog             | 11 +++++++++++
 src/psaux/cffdecode.c |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 8a308a6..123cc51 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,16 @@
 2018-10-02  Werner Lemberg  <address@hidden>
 
+       [psaux] Fix numeric overflow.
+
+       Reported as
+
+         https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10768
+
+       * src/psaux/cffdecode.c (cff_decoder_parse_charstrings) <cff_op_roll>
+       [CFF_CONFIG_OPTION_OLD_ENGINE]: Use NEG_INT.
+
+2018-10-02  Werner Lemberg  <address@hidden>
+
        [pshinter] Handle numeric overflow.
 
        Reported as
diff --git a/src/psaux/cffdecode.c b/src/psaux/cffdecode.c
index 0576ca6..b90a828 100644
--- a/src/psaux/cffdecode.c
+++ b/src/psaux/cffdecode.c
@@ -1839,7 +1839,7 @@
               /* before C99 it is implementation-defined whether    */
               /* the result of `%' is negative if the first operand */
               /* is negative                                        */
-              idx = -( ( -idx ) % count );
+              idx = -( NEG_INT( idx ) % count );
               while ( idx < 0 )
               {
                 FT_Fixed  tmp = args[0];