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[ Upstream commitf4a2da755a] Since ctx.optlen is signed, a larger value than max_value could be passed, as it is later on used as unsigned, which causes a WARN_ON_ONCE in the copy_to_user. Fixes:0d01da6afc("bpf: implement getsockopt and setsockopt hooks") Signed-off-by: Loris Reiff <loris.reiff@liblor.ch> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/bpf/20210122164232.61770-2-loris.reiff@liblor.ch 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.