1 files changed, 3 insertions, 0 deletions
diff --git a/wcsmbs/mbrtowc.c b/wcsmbs/mbrtowc.c
index 49ca9c27f9..dbfe9403a6 100644
--- a/wcsmbs/mbrtowc.c
+++ b/wcsmbs/mbrtowc.c
@@ -59,6 +59,9 @@ __mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
       n = 1;
     }
 
+  if (n == 0)
+    return (size_t) -2;
+
   /* Tell where we want the result.  */
   data.__outbuf = outbuf;
   data.__outbufend = outbuf + sizeof (wchar_t);