http://bugs.gentoo.org/284403

From 20f68fb1abe862a98bc0378e5bb54d94bb98b8fe Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <bonzini@gnu.org>
Date: Thu, 15 Oct 2009 19:56:12 +0200
Subject: [PATCH] handle incomplete sequences as if they were invalid

2009-10-15  Paolo Bonzini  <bonzini@gnu.org>
	    WANG Yunfeng  <uhuruh@gmail.com>

	* sed/execute.c (str_append, str_append_modified): Handle incomplete
	sequences as if they were invalid.
---
 ChangeLog     |    6 ++++++
 NEWS          |    4 +++-
 sed/execute.c |    6 +++---
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/sed/execute.c b/sed/execute.c
index 66cb809..d5903be 100644
--- a/sed/execute.c
+++ b/sed/execute.c
@@ -254,8 +254,8 @@ str_append(to, string, length)
       {
         size_t n = MBRLEN (string, length, &to->mbstate);
 
-        /* An invalid sequence is treated like a singlebyte character. */
-        if (n == (size_t) -1)
+        /* An invalid or imcomplete sequence is treated like a singlebyte character. */
+        if (n == (size_t) -1 || n == (size_t) -2)
 	  {
 	    memset (&to->mbstate, 0, sizeof (to->mbstate));
 	    n = 1;
@@ -341,7 +341,7 @@ str_append_modified(to, string, length, type)
       /* Copy the new wide character to the end of the string. */
       n = WCRTOMB (to->active + to->length, wc, &to->mbstate);
       to->length += n;
-      if (n == -1)
+      if (n == -1 || n == -2)
 	{
 	  fprintf (stderr, "Case conversion produced an invalid character!");
 	  abort ();
-- 
1.7.3.1