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commit6e7d801610upstream. Ben Hutchings pointed out that29b7a6fa1e("ubi: fastmap: Don't flush fastmap work on detach") does not really fix the problem, it just reduces the risk to hit the race window where fastmap work races against free()'ing ubi->volumes[]. The correct approach is making sure that no more fastmap work is in progress before we free ubi data structures. So we cancel fastmap work right after the ubi background thread is stopped. By setting ubi->thread_enabled to zero we make sure that no further work tries to wake the thread. Fixes:29b7a6fa1e("ubi: fastmap: Don't flush fastmap work on detach") Fixes:74cdaf2400("UBI: Fastmap: Fix memory leaks while closing the WL sub-system") Cc: stable@vger.kernel.org Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Cc: Martin Townsend <mtownsend1973@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.