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The expect check function __nf_ct_expect_check() asks the master_help is necessary. So it is unnecessary to go ahead in ctnetlink_alloc_expect when there is no help. Actually the commitbc01befdcf("netfilter: ctnetlink: add support for user-space expectation helpers") permits ctnetlink create one expect even though there is no master help. But the latter commit3d058d7bc2("netfilter: rework user-space expectation helper support") disables it again. Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.