diff --git a/iconv/Makefile b/iconv/Makefile
index c2299c9..30c8e83 100644
--- a/iconv/Makefile
+++ b/iconv/Makefile
@@ -42,7 +42,8 @@ CFLAGS-charmap.c = -DCHARMAP_PATH='"$(i18ndir)/charmaps"' \
 CFLAGS-linereader.c = -DNO_TRANSLITERATION
 CFLAGS-simple-hash.c = -I../locale
 
-tests	= tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6
+tests	= tst-iconv1 tst-iconv2 tst-iconv3 tst-iconv4 tst-iconv5 tst-iconv6 \
+	  tst-iconv7
 
 others		= iconv_prog iconvconfig
 install-others-programs	= $(inst_bindir)/iconv
diff --git a/iconv/gconv_simple.c b/iconv/gconv_simple.c
index f66bf34..e5284e4 100644
--- a/iconv/gconv_simple.c
+++ b/iconv/gconv_simple.c
@@ -892,7 +892,8 @@ ucs4le_internal_loop_single (struct __gconv_step *step,
     if (__glibc_likely (wc < 0x80))					      \
       /* It's an one byte sequence.  */					      \
       *outptr++ = (unsigned char) wc;					      \
-    else if (__glibc_likely (wc <= 0x7fffffff))				      \
+    else if (__glibc_likely (wc <= 0x7fffffff				      \
+			     && (wc < 0xd800 || wc > 0xdfff)))		      \
       {									      \
 	size_t step;							      \
 	unsigned char *start;						      \
diff --git a/iconv/tst-iconv7.c b/iconv/tst-iconv7.c
new file mode 100644
index 0000000..fc2e33e
--- /dev/null
+++ b/iconv/tst-iconv7.c
@@ -0,0 +1,263 @@
+/* Testing UTF conversions with UTF16 surrogates as input.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <inttypes.h>
+#include <iconv.h>
+#include <byteswap.h>
+
+static int
+run_conversion (const char *from, const char *to, char *inbuf, size_t inbuflen
+		, int exp_errno, int line)
+{
+  char outbuf[16];
+  iconv_t cd;
+  char *inptr;
+  size_t inlen;
+  char *outptr;
+  size_t outlen;
+  size_t n;
+  int e;
+  int fails = 0;
+
+  cd = iconv_open (to, from);
+  if (cd == (iconv_t) -1)
+    {
+      printf ("line %d: cannot convert from %s to %s: %m\n", line, from, to);
+      return 1;
+    }
+
+  inptr = (char *) inbuf;
+  inlen = inbuflen;
+  outptr = outbuf;
+  outlen = sizeof (outbuf);
+
+  errno = 0;
+  n = iconv (cd, &inptr, &inlen, &outptr, &outlen);
+  e = errno;
+
+  if (exp_errno == 0)
+    {
+      if (n == (size_t) -1)
+	{
+	  puts ("n should be >= 0, but n == -1");
+	  fails ++;
+	}
+
+      if (e != 0)
+	{
+	  printf ("errno should be 0: 'Success', but errno == %d: '%s'\n"
+		  , e, strerror(e));
+	  fails ++;
+	}
+    }
+  else
+    {
+      if (n != (size_t) -1)
+	{
+	  printf ("n should be -1, but n == %zd\n", n);
+	  fails ++;
+	}
+
+      if (e != exp_errno)
+	{
+	  printf ("errno should be %d: '%s', but errno == %d: '%s'\n"
+		  , exp_errno, strerror (exp_errno), e, strerror (e));
+	  fails ++;
+	}
+    }
+
+  iconv_close (cd);
+
+  if (fails > 0)
+    {
+      printf ("Errors in line %d while converting %s to %s.\n\n"
+	      , line, from, to);
+    }
+
+  return fails;
+}
+
+static int
+do_test (void)
+{
+  int fails = 0;
+  char buf[4];
+
+  /* This test runs iconv() with UTF character in range of an UTF16 surrogate.
+     UTF-16 high surrogate is in range 0xD800..0xDBFF and
+     UTF-16 low surrogate is in range 0xDC00..0xDFFF.
+     Converting from or to UTF-xx has to report errors in those cases.
+     In UTF-16, surrogate pairs with a high surrogate in front of a low
+     surrogate is valid.  */
+
+  /* Use RUN_UCS4_UTF32_INPUT to test conversion ...
+
+     ... from INTERNAL to UTF-xx[LE|BE]:
+     Converting from UCS4 to UTF-xx[LE|BE] first converts UCS4 to INTERNAL
+     without checking for UTF-16 surrogate values
+     and then converts from INTERNAL to UTF-xx[LE|BE].
+     The latter conversion has to report an error in those cases.
+
+     ... from UTF-32[LE|BE] to INTERNAL:
+     Converting directly from UTF-32LE to UTF-8|16 is needed,
+     because e.g. s390x has iconv-modules which converts directly.  */
+#define RUN_UCS4_UTF32_INPUT(b0, b1, b2, b3, err, line)			\
+  buf[0] = b0;								\
+  buf[1] = b1;								\
+  buf[2] = b2;								\
+  buf[3] = b3;								\
+  fails += run_conversion ("UCS4", "UTF-8", buf, 4, err, line);		\
+  fails += run_conversion ("UCS4", "UTF-16LE", buf, 4, err, line);	\
+  fails += run_conversion ("UCS4", "UTF-16BE", buf, 4, err, line);	\
+  fails += run_conversion ("UCS4", "UTF-32LE", buf, 4, err, line);	\
+  fails += run_conversion ("UCS4", "UTF-32BE", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32BE", "WCHAR_T", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32BE", "UTF-8", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32BE", "UTF-16LE", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32BE", "UTF-16BE", buf, 4, err, line);	\
+  buf[0] = b3;								\
+  buf[1] = b2;								\
+  buf[2] = b1;								\
+  buf[3] = b0;								\
+  fails += run_conversion ("UTF-32LE", "WCHAR_T", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32LE", "UTF-8", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32LE", "UTF-16LE", buf, 4, err, line);	\
+  fails += run_conversion ("UTF-32LE", "UTF-16BE", buf, 4, err, line);
+
+  /* Use UCS4/UTF32 input of 0xD7FF.  */
+  RUN_UCS4_UTF32_INPUT (0x0, 0x0, 0xD7, 0xFF, 0, __LINE__);
+
+  /* Use UCS4/UTF32 input of 0xD800.  */
+  RUN_UCS4_UTF32_INPUT (0x0, 0x0, 0xD8, 0x00, EILSEQ, __LINE__);
+
+  /* Use UCS4/UTF32 input of 0xDBFF.  */
+  RUN_UCS4_UTF32_INPUT (0x0, 0x0, 0xDB, 0xFF, EILSEQ, __LINE__);
+
+  /* Use UCS4/UTF32 input of 0xDC00.  */
+  RUN_UCS4_UTF32_INPUT (0x0, 0x0, 0xDC, 0x00, EILSEQ, __LINE__);
+
+  /* Use UCS4/UTF32 input of 0xDFFF.  */
+  RUN_UCS4_UTF32_INPUT (0x0, 0x0, 0xDF, 0xFF, EILSEQ, __LINE__);
+
+  /* Use UCS4/UTF32 input of 0xE000.  */
+  RUN_UCS4_UTF32_INPUT (0x0, 0x0, 0xE0, 0x00, 0, __LINE__);
+
+
+  /* Use RUN_UTF16_INPUT to test conversion from UTF16[LE|BE] to INTERNAL.
+     Converting directly from UTF-16 to UTF-8|32 is needed,
+     because e.g. s390x has iconv-modules which converts directly.
+     Use len == 2 or 4 to specify one or two UTF-16 characters.  */
+#define RUN_UTF16_INPUT(b0, b1, b2, b3, len, err, line)			\
+  buf[0] = b0;								\
+  buf[1] = b1;								\
+  buf[2] = b2;								\
+  buf[3] = b3;								\
+  fails += run_conversion ("UTF-16BE", "WCHAR_T", buf, len, err, line);	\
+  fails += run_conversion ("UTF-16BE", "UTF-8", buf, len, err, line);	\
+  fails += run_conversion ("UTF-16BE", "UTF-32LE", buf, len, err, line); \
+  fails += run_conversion ("UTF-16BE", "UTF-32BE", buf, len, err, line); \
+  buf[0] = b1;								\
+  buf[1] = b0;								\
+  buf[2] = b3;								\
+  buf[3] = b2;								\
+  fails += run_conversion ("UTF-16LE", "WCHAR_T", buf, len, err, line);	\
+  fails += run_conversion ("UTF-16LE", "UTF-8", buf, len, err, line);	\
+  fails += run_conversion ("UTF-16LE", "UTF-32LE", buf, len, err, line); \
+  fails += run_conversion ("UTF-16LE", "UTF-32BE", buf, len, err, line);
+
+  /* Use UTF16 input of 0xD7FF.  */
+  RUN_UTF16_INPUT (0xD7, 0xFF, 0xD7, 0xFF, 4, 0, __LINE__);
+
+  /* Use [single] UTF16 high surrogate 0xD800 [with a valid character behind].
+     And check an UTF16 surrogate pair [without valid low surrogate].  */
+  RUN_UTF16_INPUT (0xD8, 0x0, 0x0, 0x0, 2, EINVAL, __LINE__);
+  RUN_UTF16_INPUT (0xD8, 0x0, 0xD7, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xD8, 0x0, 0xD8, 0x0, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xD8, 0x0, 0xE0, 0x0, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xD8, 0x0, 0xDC, 0x0, 4, 0, __LINE__);
+
+  /* Use [single] UTF16 high surrogate 0xDBFF [with a valid character behind].
+     And check an UTF16 surrogate pair [without valid low surrogate].  */
+  RUN_UTF16_INPUT (0xDB, 0xFF, 0x0, 0x0, 2, EINVAL, __LINE__);
+  RUN_UTF16_INPUT (0xDB, 0xFF, 0xD7, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDB, 0xFF, 0xDB, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDB, 0xFF, 0xE0, 0x0, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDB, 0xFF, 0xDF, 0xFF, 4, 0, __LINE__);
+
+  /* Use single UTF16 low surrogate 0xDC00 [with a valid character behind].
+     And check an UTF16 surrogate pair [without valid high surrogate].   */
+  RUN_UTF16_INPUT (0xDC, 0x0, 0x0, 0x0, 2, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDC, 0x0, 0xD7, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xD8, 0x0, 0xDC, 0x0, 4, 0, __LINE__);
+  RUN_UTF16_INPUT (0xD7, 0xFF, 0xDC, 0x0, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDC, 0x0, 0xDC, 0x0, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xE0, 0x0, 0xDC, 0x0, 4, EILSEQ, __LINE__);
+
+  /* Use single UTF16 low surrogate 0xDFFF [with a valid character behind].
+     And check an UTF16 surrogate pair [without valid high surrogate].   */
+  RUN_UTF16_INPUT (0xDF, 0xFF, 0x0, 0x0, 2, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDF, 0xFF, 0xD7, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDB, 0xFF, 0xDF, 0xFF, 4, 0, __LINE__);
+  RUN_UTF16_INPUT (0xD7, 0xFF, 0xDF, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xDF, 0xFF, 0xDF, 0xFF, 4, EILSEQ, __LINE__);
+  RUN_UTF16_INPUT (0xE0, 0x0, 0xDF, 0xFF, 4, EILSEQ, __LINE__);
+
+  /* Use UCS4/UTF32 input of 0xE000.  */
+  RUN_UTF16_INPUT (0xE0, 0x0, 0xE0, 0x0, 4, 0, __LINE__);
+
+
+  /* Use RUN_UTF8_3BYTE_INPUT to test conversion from UTF-8 to INTERNAL.
+     Converting directly from UTF-8 to UTF-16|32 is needed,
+     because e.g. s390x has iconv-modules which converts directly.  */
+#define RUN_UTF8_3BYTE_INPUT(b0, b1, b2, err, line)			\
+  buf[0] = b0;								\
+  buf[1] = b1;								\
+  buf[2] = b2;								\
+  fails += run_conversion ("UTF-8", "WCHAR_T", buf, 3, err, line);	\
+  fails += run_conversion ("UTF-8", "UTF-16LE", buf, 3, err, line);	\
+  fails += run_conversion ("UTF-8", "UTF-16BE", buf, 3, err, line);	\
+  fails += run_conversion ("UTF-8", "UTF-32LE", buf, 3, err, line);	\
+  fails += run_conversion ("UTF-8", "UTF-32BE", buf, 3, err, line);
+
+  /* Use UTF-8 input of 0xD7FF.  */
+  RUN_UTF8_3BYTE_INPUT (0xED, 0x9F, 0xBF, 0, __LINE__);
+
+  /* Use UTF-8 input of 0xD800.  */
+  RUN_UTF8_3BYTE_INPUT (0xED, 0xA0, 0x80, EILSEQ, __LINE__);
+
+  /* Use UTF-8 input of 0xDBFF.  */
+  RUN_UTF8_3BYTE_INPUT (0xED, 0xAF, 0xBF, EILSEQ, __LINE__);
+
+  /* Use UTF-8 input of 0xDC00.  */
+  RUN_UTF8_3BYTE_INPUT (0xED, 0xB0, 0x80, EILSEQ, __LINE__);
+
+  /* Use UTF-8 input of 0xDFFF.  */
+  RUN_UTF8_3BYTE_INPUT (0xED, 0xBF, 0xBF, EILSEQ, __LINE__);
+
+  /* Use UTF-8 input of 0xF000.  */
+  RUN_UTF8_3BYTE_INPUT (0xEF, 0x80, 0x80, 0, __LINE__);
+
+  return fails > 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/iconvdata/utf-16.c b/iconvdata/utf-16.c
index 2d74a13..dbbcd6d 100644
--- a/iconvdata/utf-16.c
+++ b/iconvdata/utf-16.c
@@ -295,6 +295,12 @@ gconv_end (struct __gconv_step *data)
 	  {								      \
 	    uint16_t u2;						      \
 									      \
+	    if (__glibc_unlikely (u1 >= 0xdc00))			      \
+	      {								      \
+		/* This is no valid first word for a surrogate.  */	      \
+		STANDARD_FROM_LOOP_ERR_HANDLER (2);			      \
+	      }								      \
+									      \
 	    /* It's a surrogate character.  At least the first word says      \
 	       it is.  */						      \
 	    if (__glibc_unlikely (inptr + 4 > inend))			      \
@@ -329,6 +335,12 @@ gconv_end (struct __gconv_step *data)
 	  }								      \
 	else								      \
 	  {								      \
+	    if (__glibc_unlikely (u1 >= 0xdc00))			      \
+	      {								      \
+		/* This is no valid first word for a surrogate.  */	      \
+		STANDARD_FROM_LOOP_ERR_HANDLER (2);			      \
+	      }								      \
+									      \
 	    /* It's a surrogate character.  At least the first word says      \
 	       it is.  */						      \
 	    if (__glibc_unlikely (inptr + 4 > inend))			      \
diff --git a/iconvdata/utf-32.c b/iconvdata/utf-32.c
index 0d6fe30..25f6fc6 100644
--- a/iconvdata/utf-32.c
+++ b/iconvdata/utf-32.c
@@ -239,7 +239,7 @@ gconv_end (struct __gconv_step *data)
     if (swap)								      \
       u1 = bswap_32 (u1);						      \
 									      \
-    if (__glibc_unlikely (u1 >= 0x110000))				      \
+    if (__glibc_unlikely (u1 >= 0x110000 || (u1 >= 0xd800 && u1 < 0xe000)))   \
       {									      \
 	/* This is illegal.  */						      \
 	STANDARD_FROM_LOOP_ERR_HANDLER (4);				      \
-- 
2.3.0

