mpx_wrappers.c (__mpx_wrapper_memmove): Add zero length check.

libmpx/

	* mpxwrap/mpx_wrappers.c (__mpx_wrapper_memmove): Add
	zero length check.

gcc/testsuite/

	* gcc.target/i386/mpx/memmove-zero-length.c: New.

From-SVN: r221944

gcc/testsuite/ChangeLog

+2015-04-09  Ilya Enkovich  <ilya.enkovich@intel.com>
+
+	* gcc.target/i386/mpx/memmove-zero-length.c: New.
+
 2015-04-09  Kirill Yukhin  <kirill.yukhin@intel.com>
 
 	PR target/65676

gcc/testsuite/gcc.target/i386/mpx/memmove-zero-length.c

+/* { dg-do run } */
+/* { dg-options "-fcheck-pointer-bounds -mmpx" } */
+
+
+#include "mpx-check.h"
+#include "string.h"
+
+int mpx_test (int argc, const char **argv)
+{
+  int *buf = (int *)malloc (100 * sizeof(int));
+
+  memmove (buf, NULL, 0);
+  memmove (NULL, buf, 0);
+
+  free (buf);
+
+  return 0;
+}

libmpx/ChangeLog

+2015-04-09  Ilya Enkovich  <ilya.enkovich@intel.com>
+
+	* mpxwrap/mpx_wrappers.c (__mpx_wrapper_memmove): Add
+	zero length check.
+
 2015-04-02  Ilya Enkovich  <ilya.enkovich@intel.com>
 
 	PR driver/65444

libmpx/mpxwrap/mpx_wrappers.c

@@ -97,6 +97,9 @@ __mpx_wrapper_memmove (void *dst, const void *src, size_t n)
   size_t offset_src = ((size_t) s) & (sizeof (void *) - 1);
   size_t offset_dst = ((size_t) d) & (sizeof (void *) - 1);
 
+  if (n == 0)
+    return ret;
+
   __bnd_chk_ptr_bounds (dst, n);
   __bnd_chk_ptr_bounds (src, n);