CVE-2021-47098 Information

Description

In the Linux kernel the following vulnerability has been resolved:

hwmon: (lm90) Prevent integer overflow/underflow in hysteresis calculations

Commit b50aa49638c7 (\hwmon: (lm90) Prevent integer underflows of temperature calculations) addressed a number of underflow situations when writing temperature limits. However it missed one situation seen when an attempt is made to set the hysteresis value to MAX_LONG and the critical temperature limit is negative.

Use clamp_val() when setting the hysteresis temperature to ensure that the provided value can never overflow or underflow.

Reference

https://git.kernel.org/stable/c/d105f30bea9104c590a9e5b495cb8a49bdfe405f https://git.kernel.org/stable/c/55840b9eae5367b5d5b29619dc2fb7e4596dba46