xfs_attr_shortform_lookup(xfs_da_args_t *args)
{
	xfs_attr_shortform_t *sf;
	xfs_attr_sf_entry_t *sfe;
	int i;
	xfs_ifork_t *ifp;

	trace_xfs_attr_sf_lookup(args);

	ifp = args->dp->i_afp;
	ASSERT(ifp->if_flags & XFS_IFINLINE);
	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
	sfe = &sf->list[0];
	for (i = 0; i < sf->hdr.count;
				sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
		if (sfe->namelen != args->namelen)
			continue;
		if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
			continue;
		if (!xfs_attr_namesp_match(args->flags, sfe->flags))
			continue;
		return -EEXIST;
	}
	return -ENOATTR;
}

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