[freetype2] master b460a50: [truetype] Fix integer overflow.

[Werner Lemberg]

branch: master
commit b460a50610320c425292518cb5f6341af234e2f9
Author: Werner Lemberg <wl@gnu.org>
Commit: Werner Lemberg <wl@gnu.org>

    [truetype] Fix integer overflow.
    
    Reported as
    
      https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35312
    
    * src/truetype/ttinterp.c (Ins_JMPR): Use `ADD_LONG`.
---
 ChangeLog               | 10 ++++++++++
 src/truetype/ttinterp.c |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 522d084..aaec6b1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2021-06-19  Werner Lemberg  <david@freetype.org>
 
+       [truetype] Fix integer overflow.
+
+       Reported as
+
+         https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35312
+
+       * src/truetype/ttinterp.c (Ins_JMPR): Use `ADD_LONG`.
+
+2021-06-19  Werner Lemberg  <david@freetype.org>
+
        [autofit] Prevent hinting if there are too many segments.
 
        This speeds up handling of broken glyphs.
diff --git a/src/truetype/ttinterp.c b/src/truetype/ttinterp.c
index 6747f94..96b48a0 100644
--- a/src/truetype/ttinterp.c
+++ b/src/truetype/ttinterp.c
@@ -3593,7 +3593,7 @@
       return;
     }
 
-    exc->IP += args[0];
+    exc->IP = ADD_LONG( exc->IP, args[0] );
     if ( exc->IP < 0                                             ||
          ( exc->callTop > 0                                    &&
            exc->IP > exc->callStack[exc->callTop - 1].Def->end ) )