tools:iio: catch errors in string allocation

This patch catches errors in string allocation in generic_buffer.c,
iio_event_monitor.c, iio_utils.c and lsiio.c.
Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

tools/iio/generic_buffer.c

@@ -234,7 +234,9 @@ int main(int argc, char **argv)
 	}
 	printf("iio device number being used is %d\n", dev_num);
 
-	asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
+	ret = asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
+	if (ret < 0)
+		return -ENOMEM;
 
 	if (!notrigger) {
 		if (trigger_name == NULL) {

tools/iio/iio_event_monitor.c

@@ -265,6 +265,8 @@ int main(int argc, char **argv)
 		/* If we can't find a IIO device by name assume device_name is a
 		   IIO chrdev */
 		chrdev_name = strdup(device_name);
+		if (!chrdev_name)
+			return -ENOMEM;
 	}
 
 	fd = open(chrdev_name, 0);

tools/iio/iio_utils.c

@@ -36,7 +36,7 @@ int iioutils_break_up_name(const char *full_name,
 	char *current;
 	char *w, *r;
 	char *working, *prefix = "";
-	int i;
+	int i, ret;
 
 	for (i = 0; i < sizeof(iio_direction) / sizeof(iio_direction[0]); i++)
 		if (!strncmp(full_name, iio_direction[i],
@@ -46,6 +46,9 @@ int iioutils_break_up_name(const char *full_name,
 		}
 
 	current = strdup(full_name + strlen(prefix) + 1);
+	if (!current)
+		return -ENOMEM;
+
 	working = strtok(current, "_\0");
 
 	w = working;
@@ -59,10 +62,10 @@ int iioutils_break_up_name(const char *full_name,
 		r++;
 	}
 	*w = '\0';
-	asprintf(generic_name, "%s_%s", prefix, working);
+	ret = asprintf(generic_name, "%s_%s", prefix, working);
 	free(current);
 
-	return 0;
+	return (ret == -1) ? -ENOMEM : 0;
 }
 
 /**

tools/iio/lsiio.c

@@ -107,7 +107,12 @@ static void dump_devices(void)
 		if (check_prefix(ent->d_name, type_device)) {
 			char *dev_dir_name;
 
-			asprintf(&dev_dir_name, "%s%s", iio_dir, ent->d_name);
+			if (asprintf(&dev_dir_name, "%s%s", iio_dir,
+				     ent->d_name) < 0) {
+				printf("Memory allocation failed\n");
+				goto error_close_dir;
+			}
+
 			dump_one_device(dev_dir_name);
 			free(dev_dir_name);
 			if (verblevel >= VERBLEVEL_SENSORS)
@@ -119,11 +124,17 @@ static void dump_devices(void)
 		if (check_prefix(ent->d_name, type_trigger)) {
 			char *dev_dir_name;
 
-			asprintf(&dev_dir_name, "%s%s", iio_dir, ent->d_name);
+			if (asprintf(&dev_dir_name, "%s%s", iio_dir,
+				     ent->d_name) < 0) {
+				printf("Memory allocation failed\n");
+				goto error_close_dir;
+			}
+
 			dump_one_trigger(dev_dir_name);
 			free(dev_dir_name);
 		}
 	}
+error_close_dir:
 	closedir(dp);
 }