static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
				 unsigned int flags)
{
	struct ext4_extent_header *neh;
	struct buffer_head *bh;
	ext4_fsblk_t newblock, goal = 0;
	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
	int err = 0;

	/* Try to prepend new index to old one */
	if (ext_depth(inode))
		goal = ext4_idx_pblock(EXT_FIRST_INDEX(ext_inode_hdr(inode)));
	if (goal > le32_to_cpu(es->s_first_data_block)) {
		flags |= EXT4_MB_HINT_TRY_GOAL;
		goal--;
	} else
		goal = ext4_inode_to_goal_block(inode);
	newblock = ext4_new_meta_blocks(handle, inode, goal, flags,
					NULL, &err);
	if (newblock == 0)
		return err;

	bh = sb_getblk(inode->i_sb, newblock);
	if (unlikely(!bh))
		return -ENOMEM;
	lock_buffer(bh);

	err = ext4_journal_get_create_access(handle, bh);
	if (err) {
		unlock_buffer(bh);
		goto out;
	}

	/* move top-level index/leaf into new block */
	memmove(bh->b_data, EXT4_I(inode)->i_data,
		sizeof(EXT4_I(inode)->i_data));

	/* set size of new block */
	neh = ext_block_hdr(bh);
	/* old root could have indexes or leaves
	 * so calculate e_max right way */
	if (ext_depth(inode))
		neh->eh_max = cpu_to_le16(ext4_ext_space_block_idx(inode, 0));
	else
		neh->eh_max = cpu_to_le16(ext4_ext_space_block(inode, 0));
	neh->eh_magic = EXT4_EXT_MAGIC;
	ext4_extent_block_csum_set(inode, neh);
	set_buffer_uptodate(bh);
	unlock_buffer(bh);

	err = ext4_handle_dirty_metadata(handle, inode, bh);
	if (err)
		goto out;

	/* Update top-level index: num,max,pointer */
	neh = ext_inode_hdr(inode);
	neh->eh_entries = cpu_to_le16(1);
	ext4_idx_store_pblock(EXT_FIRST_INDEX(neh), newblock);
	if (neh->eh_depth == 0) {
		/* Root extent block becomes index block */
		neh->eh_max = cpu_to_le16(ext4_ext_space_root_idx(inode, 0));
		EXT_FIRST_INDEX(neh)->ei_block =
			EXT_FIRST_EXTENT(neh)->ee_block;
	}
	ext_debug("new root: num %d(%d), lblock %d, ptr %llu\n",
		  le16_to_cpu(neh->eh_entries), le16_to_cpu(neh->eh_max),
		  le32_to_cpu(EXT_FIRST_INDEX(neh)->ei_block),
		  ext4_idx_pblock(EXT_FIRST_INDEX(neh)));

	le16_add_cpu(&neh->eh_depth, 1);
	ext4_mark_inode_dirty(handle, inode);
out:
	brelse(bh);

	return err;
}

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.