diff -urNp coreutils-8.22-orig/gnulib-tests/test-parse-datetime.c coreutils-8.22/gnulib-tests/test-parse-datetime.c
--- coreutils-8.22-orig/gnulib-tests/test-parse-datetime.c	2013-12-04 15:53:33.000000000 +0100
+++ coreutils-8.22/gnulib-tests/test-parse-datetime.c	2014-03-02 20:33:25.691688592 +0100
@@ -419,5 +419,21 @@ main (int argc _GL_UNUSED, char **argv)
      starting with a high-bit-set byte would be treated like "0".  */
   ASSERT ( ! parse_datetime (&result, "\xb0", &now));
 
+  /* Exercise TZ="" parsing code.  */
+  /* These two would infloop or segfault before Feb 2014.  */
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\"\"", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\" \"", &now));
+  /* Exercise invalid patterns.  */
+  ASSERT ( ! parse_datetime (&result, "TZ=\"", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\\\"", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\\n", &now));
+  ASSERT ( ! parse_datetime (&result, "TZ=\"\\n\"", &now));
+  /* Exercise valid patterns.  */
+  ASSERT (   parse_datetime (&result, "TZ=\"\"", &now));
+  ASSERT (   parse_datetime (&result, "TZ=\"\" ", &now));
+  ASSERT (   parse_datetime (&result, " TZ=\"\"", &now));
+  ASSERT (   parse_datetime (&result, "TZ=\"\\\\\"", &now));
+  ASSERT (   parse_datetime (&result, "TZ=\"\\\"\"", &now));
+
   return 0;
 }
diff -urNp coreutils-8.22-orig/lib/parse-datetime.y coreutils-8.22/lib/parse-datetime.y
--- coreutils-8.22-orig/lib/parse-datetime.y	2013-12-04 15:53:33.000000000 +0100
+++ coreutils-8.22/lib/parse-datetime.y	2014-03-02 20:32:23.246124920 +0100
@@ -1303,8 +1303,6 @@ parse_datetime (struct timespec *result,
             char tz1buf[TZBUFSIZE];
             bool large_tz = TZBUFSIZE < tzsize;
             bool setenv_ok;
-            /* Free tz0, in case this is the 2nd or subsequent time through. */
-            free (tz0);
             tz0 = get_tz (tz0buf);
             z = tz1 = large_tz ? xmalloc (tzsize) : tz1buf;
             for (s = tzbase; *s != '"'; s++)
@@ -1316,7 +1314,12 @@ parse_datetime (struct timespec *result,
             if (!setenv_ok)
               goto fail;
             tz_was_altered = true;
+
             p = s + 1;
+            while (c = *p, c_isspace (c))
+              p++;
+
+            break;
           }
     }
 
diff -urNp coreutils-8.22-orig/tests/misc/date.pl coreutils-8.22/tests/misc/date.pl
--- coreutils-8.22-orig/tests/misc/date.pl	2013-12-04 15:48:30.000000000 +0100
+++ coreutils-8.22/tests/misc/date.pl	2014-03-02 20:30:43.200328295 +0100
@@ -287,6 +287,13 @@ my @Tests =
       {ERR => "date: invalid date '\\260'\n"},
       {EXIT => 1},
      ],
+
+     # From coreutils-5.3.0 to 8.22 inclusive
+     # this would either infinite loop or crash
+     ['invalid-TZ-crash', "-d 'TZ=\"\"\"'",
+      {ERR => "date: invalid date 'TZ=\"\"\"'\n"},
+      {EXIT => 1},
+     ],
     );
 
 # Repeat the cross-dst test, using Jan 1, 2005 and every interval from 1..364.