From: Nicholas Krause Date: Wed, 5 Aug 2015 14:44:40 +0000 (-0400) Subject: kvm: x86: Fix error handling in the function kvm_lapic_sync_from_vapic X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=603242a88ac44771442b077e0c9cb4d3af2b796f;p=linux-beck.git kvm: x86: Fix error handling in the function kvm_lapic_sync_from_vapic This fixes error handling in the function kvm_lapic_sync_from_vapic by checking if the call to kvm_read_guest_cached has returned a error code to signal to its caller the call to this function has failed and due to this we must immediately return to the caller of kvm_lapic_sync_from_vapic to avoid incorrectly call apic_set_tpc if a error has occurred here. Signed-off-by: Nicholas Krause Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 2a5ca97c263b..9a3e342e3cda 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1900,8 +1900,9 @@ void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu) if (!test_bit(KVM_APIC_CHECK_VAPIC, &vcpu->arch.apic_attention)) return; - kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data, - sizeof(u32)); + if (kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apic->vapic_cache, &data, + sizeof(u32))) + return; apic_set_tpr(vcpu->arch.apic, data & 0xff); }