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When setting a trip point temperature from sysfs, there is an upper
bound check on the user input, but no lower bound check.
As hardware register has 7 bits for a trip point temperature, the offset
to tj_max of the input temperature must be equal to/less than 0x7f.
Or else,
1. bogus temperature is updated into the trip temperature bits.
2. the upper bits of the register can be polluted.
For example,
$ rdmsr 0x1b2
2000003
$ echo -180000 > /sys/class/thermal/thermal_zone1/trip_point_1_temp
$ rdmsr 0x1b2
3980003
Not only the trip point temp is set to 76C on this platform (tj_max is
100), the Power Notification (Bit 24) is also enabled erronously.
Fix the problem by adding lower bound check for sysfs input.
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/all/add7a378-4d50-4ba1-81d3-a0c17db25a0b@kili.mountain/
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2a96243e22