TOMOYO: Accept \000 as a valid character.

TOMOYO 2.5 in Linux 3.2 and later handles Unix domain socket's address.
Thus, tomoyo_correct_word2() needs to accept \000 as a valid character, or
TOMOYO 2.5 cannot handle Unix domain's abstract socket address.

Reported-by: Steven Allen <steven@stebalien.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
CC: stable@vger.kernel.org [3.2+]
Signed-off-by: James Morris <jmorris@namei.org>

security/tomoyo/util.c

@@ -492,13 +492,13 @@ static bool tomoyo_correct_word2(const char *string, size_t len)
 				if (d < '0' || d > '7' || e < '0' || e > '7')
 					break;
 				c = tomoyo_make_byte(c, d, e);
-				if (tomoyo_invalid(c))
-					continue; /* pattern is not \000 */
+				if (c <= ' ' || c >= 127)
+					continue;
 			}
 			goto out;
 		} else if (in_repetition && c == '/') {
 			goto out;
-		} else if (tomoyo_invalid(c)) {
+		} else if (c <= ' ' || c >= 127) {
 			goto out;
 		}
 	}