static ssize_t boot_acl_store()

in domain.c [164:237]

• 57 lines of code
• 14 McCabe index (conditional complexity)

static ssize_t boot_acl_store(struct device *dev, struct device_attribute *attr,
			      const char *buf, size_t count)
{
	struct tb *tb = container_of(dev, struct tb, dev);
	char *str, *s, *uuid_str;
	ssize_t ret = 0;
	uuid_t *acl;
	int i = 0;

	/*
	 * Make sure the value is not bigger than tb->nboot_acl * UUID
	 * length + commas and optional "\n". Also the smallest allowable
	 * string is tb->nboot_acl * ",".
	 */
	if (count > (UUID_STRING_LEN + 1) * tb->nboot_acl + 1)
		return -EINVAL;
	if (count < tb->nboot_acl - 1)
		return -EINVAL;

	str = kstrdup(buf, GFP_KERNEL);
	if (!str)
		return -ENOMEM;

	acl = kcalloc(tb->nboot_acl, sizeof(uuid_t), GFP_KERNEL);
	if (!acl) {
		ret = -ENOMEM;
		goto err_free_str;
	}

	uuid_str = strim(str);
	while ((s = strsep(&uuid_str, ",")) != NULL && i < tb->nboot_acl) {
		size_t len = strlen(s);

		if (len) {
			if (len != UUID_STRING_LEN) {
				ret = -EINVAL;
				goto err_free_acl;
			}
			ret = uuid_parse(s, &acl[i]);
			if (ret)
				goto err_free_acl;
		}

		i++;
	}

	if (s || i < tb->nboot_acl) {
		ret = -EINVAL;
		goto err_free_acl;
	}

	pm_runtime_get_sync(&tb->dev);

	if (mutex_lock_interruptible(&tb->lock)) {
		ret = -ERESTARTSYS;
		goto err_rpm_put;
	}
	ret = tb->cm_ops->set_boot_acl(tb, acl, tb->nboot_acl);
	if (!ret) {
		/* Notify userspace about the change */
		kobject_uevent(&tb->dev.kobj, KOBJ_CHANGE);
	}
	mutex_unlock(&tb->lock);

err_rpm_put:
	pm_runtime_mark_last_busy(&tb->dev);
	pm_runtime_put_autosuspend(&tb->dev);
err_free_acl:
	kfree(acl);
err_free_str:
	kfree(str);

	return ret ?: count;
}