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KVM: arm64: Don't leak PFN when kvm_translate_vncr() races MMU notifier

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In the case that kvm_translate_vncr() races with an MMU notifier the
early return does not release a reference on the faulted in PFN. Add
the necessary call to kvm_release_faultin_page() for the unused PFN.

Cc: stable@vger.kernel.org
Fixes: 069a05e535 ("KVM: arm64: nv: Handle VNCR_EL2-triggered faults")
Reported-by: Sashiko (local):gemini-3.1-pro
Signed-off-by: Oliver Upton <oupton@kernel.org>
Link: https://patch.msgid.link/20260602235450.103057-2-oupton@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2026-06-02 16:54:46 -07:00 committed by Marc Zyngier
parent a62b4226ae
commit 9f76b039a7
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/kvm/nested.c
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@ -1326,8 +1326,10 @@ static int kvm_translate_vncr(struct kvm_vcpu *vcpu, bool *is_gmem)
}
scoped_guard(write_lock, &vcpu->kvm->mmu_lock) {
if (mmu_invalidate_retry(vcpu->kvm, mmu_seq))
if (mmu_invalidate_retry(vcpu->kvm, mmu_seq)) {
kvm_release_faultin_page(vcpu->kvm, page, true, false);
return -EAGAIN;
}
vt->gva = va;
vt->hpa = pfn << PAGE_SHIFT;