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5.10 stable commit2b00b2a0e6("writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs") is a backport of upstream 6.3 commit1ba1199ec5. In the 5.10 stable commit backport percpu_ref_exit() is called twice: first in cgwb_release_workfn() and then in cgwb_free_rcu(). The 2nd call is benign as percpu_ref_exit() internally detects there's nothing to do. This fixes an non-upstream issue that only applies to 5.10.y. Fixes:2b00b2a0e6("writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs") Signed-off-by: Greg Thelen <gthelen@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.