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[ Upstream commitbcd9e3c165] nf_flow_table_block_setup and the driver TC_SETUP_FT call can modify the flow block cb list while they are being traversed elsewhere, causing a crash. Add a write lock around the calls to protect readers Fixes:c29f74e0df("netfilter: nf_flow_table: hardware offload support") Reported-by: Chad Monroe <chad.monroe@smartrg.com> Signed-off-by: Felix Fietkau <nbd@nbd.name> 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.