string.c: fix rb_external_str_new_with_enc

* string.c (rb_external_str_new_with_enc): do not search non-ascii
  by NULL pointer.  [ruby-core:84055] [Bug #14150]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/string.c b/string.c
index 806436e327..56b6f641c6 100644
--- a/string.c
+++ b/string.c
@@ -1011,6 +1011,10 @@ rb_external_str_new_with_enc(const char *ptr, long len, rb_encoding *eenc)
     VALUE str;
     const int eidx = rb_enc_to_index(eenc);
 
+    if (!ptr) {
+	return rb_tainted_str_new_with_enc(ptr, len, eenc);
+    }
+
     /* ASCII-8BIT case, no conversion */
     if ((eidx == rb_ascii8bit_encindex()) ||
 	(eidx == rb_usascii_encindex() && search_nonascii(ptr, ptr + len))) {