int ext4_ext_precache(struct inode *inode)
{
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct ext4_ext_path *path = NULL;
	struct buffer_head *bh;
	int i = 0, depth, ret = 0;

	if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
		return 0;	/* not an extent-mapped inode */

	down_read(&ei->i_data_sem);
	depth = ext_depth(inode);

	path = kzalloc(sizeof(struct ext4_ext_path) * (depth + 1),
		       GFP_NOFS);
	if (path == NULL) {
		up_read(&ei->i_data_sem);
		return -ENOMEM;
	}

	/* Don't cache anything if there are no external extent blocks */
	if (depth == 0)
		goto out;
	path[0].p_hdr = ext_inode_hdr(inode);
	ret = ext4_ext_check(inode, path[0].p_hdr, depth, 0);
	if (ret)
		goto out;
	path[0].p_idx = EXT_FIRST_INDEX(path[0].p_hdr);
	while (i >= 0) {
		/*
		 * If this is a leaf block or we've reached the end of
		 * the index block, go up
		 */
		if ((i == depth) ||
		    path[i].p_idx > EXT_LAST_INDEX(path[i].p_hdr)) {
			brelse(path[i].p_bh);
			path[i].p_bh = NULL;
			i--;
			continue;
		}
		bh = read_extent_tree_block(inode,
					    ext4_idx_pblock(path[i].p_idx++),
					    depth - i - 1,
					    EXT4_EX_FORCE_CACHE);
		if (IS_ERR(bh)) {
			ret = PTR_ERR(bh);
			break;
		}
		i++;
		path[i].p_bh = bh;
		path[i].p_hdr = ext_block_hdr(bh);
		path[i].p_idx = EXT_FIRST_INDEX(path[i].p_hdr);
	}
	ext4_set_inode_state(inode, EXT4_STATE_EXT_PRECACHED);
out:
	up_read(&ei->i_data_sem);
	ext4_ext_drop_refs(path);
	kfree(path);
	return ret;
}

Originally addressing errors in controlling program flow through indirect calls or jumps, this CWE has been deprecated and its concerns merged into more precise modern classifications.