fix resource leaks reported by coverity

Signed-off-by: Peng Tao <bergwolf@gmail.com>

Author: bergwolf

src/exec.c

@@ -261,7 +261,7 @@ static int hyper_setup_exec_user(struct hyper_exec *exec)
 		struct group *gr = hyper_getgrnam(group);
 		if (gr == NULL) {
 			perror("can't find the group");
-			return -1;
+			goto fail;
 		}
 		gid = gr->gr_gid;
 	}
@@ -414,8 +414,12 @@ static int hyper_install_process_stdio(struct hyper_exec *e, struct stdio_config
 
 		sprintf(ptmx, "/dev/pts/%d", e->ptyno);
 		ptyslave = open(ptmx, O_RDWR | O_CLOEXEC);
-		if (ptyslave < 0 || ioctl(ptyslave, TIOCSCTTY, NULL) < 0) {
+		if (ptyslave < 0) {
+			perror("open pty device for execcmd failed");
+			goto out;
+		} if (ioctl(ptyslave, TIOCSCTTY, NULL) < 0) {
 			perror("ioctl pty device for execcmd failed");
+			close(ptyslave);
 			goto out;
 		}
 		io->stdinfd = ptyslave;

src/init.c

@@ -132,7 +132,7 @@ static void hyper_term_all(struct hyper_pod *pod)
 	int pid;
 	DIR *dp;
 	struct dirent *de;
-	pid_t *pids = NULL;
+	pid_t *pidsnew, *pids = NULL;
 	struct hyper_exec *e;
 	pid_t hyperstart_pid;
 
@@ -152,9 +152,13 @@ static void hyper_term_all(struct hyper_pod *pod)
 		if (pid == hyperstart_pid)
 			continue;
 		if (index <= npids) {
-			pids = realloc(pids, npids + 16384);
-			if (pids == NULL)
+			pidsnew = realloc(pids, npids + 16384);
+			if (pidsnew == NULL) {
+				free(pids);
+				closedir(dp);
 				return;
+			}
+			pids = pidsnew;
 			npids += 16384;
 		}
 

src/parse.c

@@ -1075,7 +1075,7 @@ static int hyper_parse_string_array(char *json, jsmntok_t *toks, char *field,
 	dbg_pr(stdout, "%s count %d\n", field, *num);
 
 	values = calloc(*num, sizeof(*values));
-	if (data == NULL) {
+	if (values == NULL) {
 		dbg_pr(stdout, "alloc memory for %s failed\n", field);
 		return -1;
 	}

src/util.c

@@ -676,8 +676,12 @@ int hyper_open_channel(char *channel, int mode)
 		fd = open(path, O_RDONLY);
 
 		memset(name, 0, sizeof(name));
-		if (fd < 0 || read(fd, name, sizeof(name)) < 0)
+		if (fd < 0)
+			continue;
+		if (read(fd, name, sizeof(name)) < 0) {
+			close(fd);
 			continue;
+		}
 
 		close(fd);
 		fd = -1;