1 files changed, 29 insertions, 1 deletions
diff --git a/libio/test-fmemopen.c b/libio/test-fmemopen.c
index 63ca89f300..e8e757f351 100644
--- a/libio/test-fmemopen.c
+++ b/libio/test-fmemopen.c
@@ -22,6 +22,32 @@ static char buffer[] = "foobar";
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <mcheck.h>
+
+static int
+do_bz18820 (void)
+{
+  char ch;
+  FILE *stream;
+
+  stream = fmemopen (&ch, 1, "?");
+  if (stream)
+    {
+      printf ("fmemopen: expected NULL, got %p\n", stream);
+      fclose (stream);
+      return 1;
+    }
+
+  stream = fmemopen (NULL, 42, "?");
+  if (stream)
+    {
+      printf ("fmemopen: expected NULL, got %p\n", stream);
+      fclose (stream);
+      return 2;
+    }
+
+  return 0;
+}
 
 static int
 do_test (void)
@@ -30,6 +56,8 @@ do_test (void)
   FILE *stream;
   int ret = 0;
 
+  mtrace ();
+
   stream = fmemopen (buffer, strlen (buffer), "r+");
 
   while ((ch = fgetc (stream)) != EOF)
@@ -44,7 +72,7 @@ do_test (void)
 
   fclose (stream);
 
-  return ret;
+  return ret + do_bz18820 ();
 }
 
 #define TEST_FUNCTION do_test ()