[freetype2] master bfe5329: [psaux] Fix numeric overflow.

[Werner LEMBERG]

branch: master
commit bfe53294757b03873b1432b7c1cd3e027802c634
Author: Werner Lemberg <address@hidden>
Commit: Werner Lemberg <address@hidden>

    [psaux] Fix numeric overflow.
    
    Triggered by
    
      https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11157
    
    * src/psaux/cffdecode.c (cff_decoder_parse_charstrings) <cff_op_blend>
    [CFF_CONFIG_OPTION_OLD_ENGINE]: Fix integer overflow.
---
 ChangeLog             | 11 +++++++++++
 src/psaux/cffdecode.c |  3 ++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index d96be84..5bb6ba7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2018-10-27  Werner Lemberg  <address@hidden>
+
+       [psaux] Fix numeric overflow.
+
+       Triggered by
+
+         https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11157
+
+       * src/psaux/cffdecode.c (cff_decoder_parse_charstrings) <cff_op_blend>
+       [CFF_CONFIG_OPTION_OLD_ENGINE]: Fix integer overflow.
+
 2018-10-20  Werner Lemberg  <address@hidden>
 
        Avoid endless loop while tracing (#54858).
diff --git a/src/psaux/cffdecode.c b/src/psaux/cffdecode.c
index 58a516f..ac1bc1f 100644
--- a/src/psaux/cffdecode.c
+++ b/src/psaux/cffdecode.c
@@ -1950,7 +1950,8 @@
             if ( num_results < 0 )
               goto Syntax_Error;
 
-            if ( num_results * (FT_Int)num_designs > num_args )
+            if ( num_results > num_args                       ||
+                 num_results * (FT_Int)num_designs > num_args )
               goto Stack_Underflow;
 
             /* since we currently don't handle interpolation of multiple */