CVE-2020-36776

In the Linux kernel, the following vulnerability has been resolved:

thermal/drivers/cpufreq_cooling: Fix slab OOB issue

Slab OOB issue is scanned by KASAN in cpu_power_to_freq(). If power is limited below the power of OPP0 in EM table, it will cause slab out-of-bound issue with negative array index.

Return the lowest frequency if limited power cannot found a suitable OPP in EM table to fix this issue.

Backtrace: [] die+0x104/0x5ac [] bug_handler+0x64/0xd0 [] brk_handler+0x160/0x258 [] do_debug_exception+0x248/0x3f0 [] el1_dbg+0x14/0xbc [] __kasan_report+0x1dc/0x1e0 [] kasan_report+0x10/0x20 [] __asan_report_load8_noabort+0x18/0x28 [] cpufreq_power2state+0x180/0x43c [] power_actor_set_power+0x114/0x1d4 [] allocate_power+0xaec/0xde0 [] power_allocator_throttle+0x3ec/0x5a4 [] handle_thermal_trip+0x160/0x294 [] thermal_zone_device_check+0xe4/0x154 [] process_one_work+0x5e4/0xe28 [] worker_thread+0xa4c/0xfac [] kthread+0x33c/0x358 [] ret_from_fork+0xc/0x18