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[174.95.215.133]) by smtp.gmail.com with ESMTPSA id y3sm5305224qto.2.2020.10.25.11.53.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Oct 2020 11:53:39 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Vitaly Kuznetsov , peterx@redhat.com, Sean Christopherson , Paolo Bonzini , Steffen Dirkwinkel Subject: [PATCH 2/2] KVM: X86: Fix null pointer reference for KVM_GET_MSRS Date: Sun, 25 Oct 2020 14:53:34 -0400 Message-Id: <20201025185334.389061-3-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201025185334.389061-1-peterx@redhat.com> References: <20201025185334.389061-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org kvm_msr_ignored_check() could trigger a null pointer reference if ignore_msrs=Y and report_ignore_msrs=Y when try to fetch an invalid feature msr using the global KVM_GET_MSRS. Degrade the error report to not rely on vcpu since that information (index, rip) is not as important as msr index/data after all. Fixes: 12bc2132b15e0a96 Reported-by: Steffen Dirkwinkel Signed-off-by: Peter Xu --- arch/x86/kvm/x86.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ce856e0ece84..5993fbd6d2c5 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -259,8 +259,8 @@ static int kvm_msr_ignored_check(struct kvm_vcpu *vcpu, u32 msr, if (ignore_msrs) { if (report_ignored_msrs) - vcpu_unimpl(vcpu, "ignored %s: 0x%x data 0x%llx\n", - op, msr, data); + kvm_pr_unimpl("ignored %s: 0x%x data 0x%llx\n", + op, msr, data); /* Mask the error */ return 0; } else { -- 2.26.2