From: Marc Zyngier Date: Mon, 10 Apr 2017 09:19:44 +0000 (+0100) Subject: KVM: arm/arm64: vgic-v3: Fix off-by-one LR access X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=cffcd9df10daa753610d79f018466f9c61603b97;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git KVM: arm/arm64: vgic-v3: Fix off-by-one LR access When iterating over the used LRs, be careful not to try to access an unused LR, or even an unimplemented one if you're unlucky... Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall --- diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c index 91922c1eddc8..bce6037cf01d 100644 --- a/virt/kvm/arm/hyp/vgic-v3-sr.c +++ b/virt/kvm/arm/hyp/vgic-v3-sr.c @@ -143,7 +143,7 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu) val = read_gicreg(ICH_VTR_EL2); nr_pri_bits = vtr_to_nr_pri_bits(val); - for (i = 0; i <= used_lrs; i++) { + for (i = 0; i < used_lrs; i++) { if (cpu_if->vgic_elrsr & (1 << i)) cpu_if->vgic_lr[i] &= ~ICH_LR_STATE; else