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[ Upstream commit d57431c6f511bf020e474026d9f3123d7bfbea8c ] In order not to call copy_to_user (from fiemap_fill_next_extent) we allocate memory in the kernel, fill it and copy it to user memory after up_read(run_lock). Reported-by: syzbot+36bb70085ef6edc2ebb9@syzkaller.appspotmail.com Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com> 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.