 static int tcmu_glfs_open(struct tcmu_device *dev)
 {
 	struct glfs_state *gfsp;
	int ret = 0;
	char *config;
	struct stat st;

	gfsp = calloc(1, sizeof(*gfsp));
	if (!gfsp)
		return -ENOMEM;

	tcmu_set_dev_private(dev, gfsp);

	config = tcmu_get_path(dev);
	if (!config) {
		goto fail;
	}

	gfsp->fs = tcmu_create_glfs_object(config, &gfsp->hosts);
	if (!gfsp->fs) {
		tcmu_err("tcmu_create_glfs_object failed\n");
		goto fail;
	}

	gfsp->gfd = glfs_open(gfsp->fs, gfsp->hosts->path, ALLOWED_BSOFLAGS);
	if (!gfsp->gfd) {
		tcmu_err("glfs_open failed: %m\n");
		goto unref;
	}

	ret = glfs_lstat(gfsp->fs, gfsp->hosts->path, &st);
	if (ret) {
		tcmu_err("glfs_lstat failed: %m\n");
		goto unref;
	}

	if (st.st_size != tcmu_get_device_size(dev)) {
		tcmu_err("device size and backing size disagree: "
		       "device %lld backing %lld\n",
		       tcmu_get_device_size(dev),
		       (long long) st.st_size);
		goto unref;
	}

	return 0;

unref:
	gluster_cache_refresh(gfsp->fs, tcmu_get_path(dev));

fail:
	if (gfsp->gfd)
		glfs_close(gfsp->gfd);
	gluster_free_server(&gfsp->hosts);
	free(gfsp);

	return -EIO;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.