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Yongqiang Liu 5c51054896 cpufreq: Init completion before kobject_init_and_add()
In cpufreq_policy_alloc(), it will call uninitialed completion in
cpufreq_sysfs_release() when kobject_init_and_add() fails. And
that will cause a crash such as the following page fault in complete:

BUG: unable to handle page fault for address: fffffffffffffff8
[..]
RIP: 0010:complete+0x98/0x1f0
[..]
Call Trace:
 kobject_put+0x1be/0x4c0
 cpufreq_online.cold+0xee/0x1fd
 cpufreq_add_dev+0x183/0x1e0
 subsys_interface_register+0x3f5/0x4e0
 cpufreq_register_driver+0x3b7/0x670
 acpi_cpufreq_init+0x56c/0x1000 [acpi_cpufreq]
 do_one_initcall+0x13d/0x780
 do_init_module+0x1c3/0x630
 load_module+0x6e67/0x73b0
 __do_sys_finit_module+0x181/0x240
 do_syscall_64+0x35/0x80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Fixes: 4ebe36c94a ("cpufreq: Fix kobject memleak")
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 5.2+ <stable@vger.kernel.org> # 5.2+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
History 2022-11-30 19:37:24 +01:00
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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.