xfs_attr_shortform_allfit(
	struct xfs_buf		*bp,
	struct xfs_inode	*dp)
{
	struct xfs_attr_leafblock *leaf;
	struct xfs_attr_leaf_entry *entry;
	xfs_attr_leaf_name_local_t *name_loc;
	struct xfs_attr3_icleaf_hdr leafhdr;
	int			bytes;
	int			i;
	struct xfs_mount	*mp = bp->b_target->bt_mount;

	leaf = bp->b_addr;
	xfs_attr3_leaf_hdr_from_disk(mp->m_attr_geo, &leafhdr, leaf);
	entry = xfs_attr3_leaf_entryp(leaf);

	bytes = sizeof(struct xfs_attr_sf_hdr);
	for (i = 0; i < leafhdr.count; entry++, i++) {
		if (entry->flags & XFS_ATTR_INCOMPLETE)
			continue;		/* don't copy partial entries */
		if (!(entry->flags & XFS_ATTR_LOCAL))
			return 0;
		name_loc = xfs_attr3_leaf_name_local(leaf, i);
		if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
			return 0;
		if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX)
			return 0;
		bytes += sizeof(struct xfs_attr_sf_entry) - 1
				+ name_loc->namelen
				+ be16_to_cpu(name_loc->valuelen);
	}
	if ((dp->i_mount->m_flags & XFS_MOUNT_ATTR2) &&
	    (dp->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
	    (bytes == sizeof(struct xfs_attr_sf_hdr)))
		return -1;
	return xfs_attr_shortform_bytesfit(dp, bytes);
}

The product dereferences a pointer that it expects to be valid but is NULL.