misc-progs: smartctrl: Sanitise device name

Fixes: #12562
Reported-by: Albert Schwarzkopf <ipfire@quitesimple.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/misc-progs/smartctrl.c

@@ -22,6 +22,11 @@ int main(int argc, char *argv[]) {
 		exit(1);
 	}
 
+	if (!is_valid_argument_alnum(argv[1])) {
+		fprintf(stderr, "Invalid device name '%s'\n", argv[1]);
+		exit(2);
+	}
+
 	char command[STRING_SIZE];
 	snprintf(command, STRING_SIZE, "/var/run/hddshutdown-%s", argv[1]);