perf/x86/intel: Fix segfault with PEBS-via-PT with sample_freq

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

perf/x86/intel: Fix segfault with PEBS-via-PT with sample_freq

Currently, using PEBS-via-PT with a sample frequency instead of a sample

period, causes a segfault. For example:

BUG: kernel NULL pointer dereference, address: 0000000000000195

<NMI>

? __die_body.cold+0x19/0x27

? page_fault_oops+0xca/0x290

? exc_page_fault+0x7e/0x1b0

? asm_exc_page_fault+0x26/0x30

? intel_pmu_pebs_event_update_no_drain+0x40/0x60

? intel_pmu_pebs_event_update_no_drain+0x32/0x60

intel_pmu_drain_pebs_icl+0x333/0x350

handle_pmi_common+0x272/0x3c0

intel_pmu_handle_irq+0x10a/0x2e0

perf_event_nmi_handler+0x2a/0x50

That happens because intel_pmu_pebs_event_update_no_drain() assumes all the

pebs_enabled bits represent counter indexes, which is not always the case.

In this particular case, bits 60 and 61 are set for PEBS-via-PT purposes.

The behaviour of PEBS-via-PT with sample frequency is questionable because

although a PMI is generated (PEBS_PMI_AFTER_EACH_RECORD), the period is not

adjusted anyway.

Putting that aside, fix intel_pmu_pebs_event_update_no_drain() by passing

the mask of counter bits instead of 'size'. Note, prior to the Fixes

commit, 'size' would be limited to the maximum counter index, so the issue

was not hit.