linux-kernel - Re: [PATCH] KVM: x86/pmu: Fix type length error when reading pmu->fixed_ctr

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Date: Fri,  2 Feb 2024 16:11:29 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Mingwei Zhang <mizhang@...gle.com>
Cc: "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86/pmu: Fix type length error when reading pmu->fixed_ctr_ctrl

On Tue, 23 Jan 2024 22:12:20 +0000, Mingwei Zhang wrote:
> Fix type length error since pmu->fixed_ctr_ctrl is u64 but the local
> variable old_fixed_ctr_ctrl is u8. Truncating the value leads to
> information loss at runtime. This leads to incorrect value in old_ctrl
> retrieved from each field of old_fixed_ctr_ctrl and causes incorrect code
> execution within the for loop of reprogram_fixed_counters(). So fix this
> type to u64.
> 
> [...]

Applied to kvm-x86 fixes.  I'll let it stew in -next for a few days before
sending a pull request to Paolo.  Thanks!

[1/1] KVM: x86/pmu: Fix type length error when reading pmu->fixed_ctr_ctrl
      https://github.com/kvm-x86/linux/commit/05519c86d699

--
https://github.com/kvm-x86/linux/tree/next