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[ Upstream commite3245a7b7b] Syzbot hit use-after-free in nf_tables_dump_sets. The problem was in missing lock protection for nft_ct_pcpu_template_refcnt. Before commitf102d66b33("netfilter: nf_tables: use dedicated mutex to guard transactions") all transactions were serialized by global mutex, but then global mutex was changed to local per netnamespace commit_mutex. This change causes use-after-free bug, when 2 netnamespaces concurently changing nft_ct_pcpu_template_refcnt without proper locking. Fix it by adding nft_ct_pcpu_mutex and protect all nft_ct_pcpu_template_refcnt changes with it. Fixes:f102d66b33("netfilter: nf_tables: use dedicated mutex to guard transactions") Reported-and-tested-by: syzbot+649e339fa6658ee623d3@syzkaller.appspotmail.com Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> Acked-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.