static int udf_symlink_filler(struct file *file, struct page *page)
{
 	struct inode *inode = page->mapping->host;
 	struct buffer_head *bh = NULL;
 	unsigned char *symlink;
	int err = -EIO;
 	unsigned char *p = kmap(page);
 	struct udf_inode_info *iinfo;
 	uint32_t pos;
 
 	iinfo = UDF_I(inode);
 	pos = udf_block_map(inode, 0);
 
	down_read(&iinfo->i_data_sem);
	if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
		symlink = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 	} else {
 		bh = sb_bread(inode->i_sb, pos);
 
		if (!bh)
			goto out;
 
 		symlink = bh->b_data;
 	}

	udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p);
	brelse(bh);

	up_read(&iinfo->i_data_sem);
	SetPageUptodate(page);
	kunmap(page);
 	unlock_page(page);
 	return 0;
 
out:
 	up_read(&iinfo->i_data_sem);
 	SetPageError(page);
 	kunmap(page);
 	unlock_page(page);
 	return err;
}

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.