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[ Upstream commit e1c3cdb26ab881b77486dc50370356a349077c74 ] Fields of md(mport_dev) are set after cdev_device_add(). However, the file operation callbacks can be called after cdev_device_add() and therefore accesses to fields of md in the callbacks can race with the rest of the mport_cdev_add() function. One such example is INIT_LIST_HEAD(&md->portwrites) in mport_cdev_add(), the list is initialised after cdev_device_add(). This can race with list_add_tail(&pw_filter->md_node,&md->portwrites) in rio_mport_add_pw_filter() which is called by unlocked_ioctl. To avoid such data races use cdev_device_add() after initializing md. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Alexandre Bounine <alex.bou9@gmail.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Mike Marshall <hubcap@omnibond.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Allison Randal <allison@lohutok.net> Cc: Pavel Andrianov <andrianov@ispras.ru> Link: http://lkml.kernel.org/r/20200426112950.1803-1-madhuparnabhowmik10@gmail.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.