merges r23190 from trunk into ruby_1_9_1.

--
* dir.c (fnmatch_helper): use rb_enc_precise_mbclen and
  fail if bytes are invalid. [ruby-dev:38307]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@23337 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/dir.c b/dir.c
index f62fc416b6..f27f04c40a 100644
--- a/dir.c
+++ b/dir.c
@@ -224,7 +224,9 @@ fnmatch_helper(
 	    RETURN(ISEND(p) ? 0 : FNM_NOMATCH);
 	if (ISEND(p))
 	    goto failed;
-	r = rb_enc_mbclen(p, pend, enc);
+	r = rb_enc_precise_mbclen(p, pend, enc);
+	if (!MBCLEN_CHARFOUND_P(r))
+	    goto failed;
 	if (r <= (send-s) && memcmp(p, s, r) == 0) {
 	    p += r;
 	    s += r;