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-rw-r--r--iconv/gconv.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/iconv/gconv.c b/iconv/gconv.c
index 0cbb052a6d..5df16354b6 100644
--- a/iconv/gconv.c
+++ b/iconv/gconv.c
@@ -30,6 +30,9 @@ __gconv (gconv_t cd, const char **inbuf, size_t *inbytesleft, char **outbuf,
   size_t oldinbytes = *inbytesleft;
   int result;
 
+  if (cd == (gconv_t) -1L)
+    return GCONV_ILLEGAL_DESCRIPTOR;
+
   cd->data[last_step].outbuf = *outbuf;
   cd->data[last_step].outbufavail = 0;
   cd->data[last_step].outbufsize = *outbytesleft;