runtime: Reject surrogate pairs in range over string.

From-SVN: r191638

diff --git a/libgo/runtime/go-rune.c b/libgo/runtime/go-rune.c
index 7e31eb8d6229a371436a9aaffd3afb7e3b22ddf1..acdecb02467b7ae6c60a9ea84373f1c28cf6f306 100644 (file)
--- a/libgo/runtime/go-rune.c
+++ b/libgo/runtime/go-rune.c
@@ -53,6 +53,14 @@ __go_get_rune (const unsigned char *str, size_t len, int *rune)
       *rune = (((c & 0xf) << 12)
               + ((c1 & 0x3f) << 6)
               + (c2 & 0x3f));
+
+      if (*rune >= 0xd800 && *rune < 0xe000)
+       {
+         /* Invalid surrogate half; return replace character.  */
+         *rune = 0xfffd;
+         return 1;
+       }
+
       return 3;
     }