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| author | Kai Shen <shenkai8@huawei.com> | 2019-11-07 06:08:17 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-11-08 11:49:15 +0100 |
| commit | e6e8df07268c1f75dd9215536e2ce4587b70f977 (patch) | |
| tree | e175fbffe87247ea20ffee6fb4e32912f7d939ff /arch/arm/mach-uniphier | |
| parent | cpufreq: intel_pstate: Fix plain int as pointer warning from sparse (diff) | |
| download | linux-e6e8df07268c1f75dd9215536e2ce4587b70f977.tar.xz linux-e6e8df07268c1f75dd9215536e2ce4587b70f977.zip | |
cpufreq: Add NULL checks to show() and store() methods of cpufreq
Add NULL checks to show() and store() in cpufreq.c to avoid attempts
to invoke a NULL callback.
Though some interfaces of cpufreq are set as read-only, users can
still get write permission using chmod which can lead to a kernel
crash, as follows:
chmod +w /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
echo 1 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
This bug was found in linux 4.19.
Signed-off-by: Kai Shen <shenkai8@huawei.com>
Reported-by: Feilong Lin <linfeilong@huawei.com>
Reviewed-by: Feilong Lin <linfeilong@huawei.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject & changelog ]
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/arm/mach-uniphier')
0 files changed, 0 insertions, 0 deletions