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[ Upstream commitf6594c372a] If a ruleset declares a set name that matches an existing set in the kernel, then validate that this declaration really refers to the same set, otherwise bail out with EEXIST. Currently, the kernel reports success when adding a set that already exists in the kernel. This usually results in EINVAL errors at a later stage, when the user adds elements to the set, if the set declaration mismatches the existing set representation in the kernel. Add a new function to check that the set declaration really refers to the same existing set in the kernel. Fixes:96518518cc("netfilter: add nftables") Reported-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.