Fix Coverity CID 265222, guard init_request::data member

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/api.c

@@ -275,6 +275,9 @@ static void api_cb(uev_t *w, void *arg, int events)
 			break;
 		}
 
+		/* Make sure no API using init_request::data can be abused */
+		rq.data_guard = 0;
+
 		if (rq.magic != INIT_MAGIC || len != sizeof(rq)) {
 			_e("Invalid initctl request");
 			break;

src/finit.h

@@ -84,12 +84,14 @@
 #define INIT_CMD_NACK           254
 #define INIT_CMD_ACK            255
 
+/* Traditionally aligned on 384 bytes */
 struct init_request {
 	int	magic;		/* Magic number			*/
 	int	cmd;		/* What kind of request		*/
 	int	runlevel;	/* Runlevel to change to	*/
 	int	sleeptime;	/* Time between TERM and KILL	*/
-	char	data[368];
+	char	data[367];
+	char	data_guard;	/* Forced to '\0' by Finit      */
 };
 
 extern int    runlevel;

src/initctl.c

@@ -204,7 +204,7 @@ static void show_cond_one(const char *_conds)
 
 static int do_cond_magic(char op, char *cond)
 {
-	char event[368];	/* sizeof(init_request.data) */
+	char event[367];	/* sizeof(init_request.data) */
 
 	if (!cond || strlen(cond) < 1)
 		return 1;