From patchwork Tue Jun 22 15:09:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 12337799 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 598F6C48BE5 for ; Tue, 22 Jun 2021 15:09:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B65E600D3 for ; Tue, 22 Jun 2021 15:09:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232069AbhFVPLy (ORCPT ); Tue, 22 Jun 2021 11:11:54 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:56800 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231680AbhFVPLx (ORCPT ); Tue, 22 Jun 2021 11:11:53 -0400 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1lvi1Z-0000T7-2p; Tue, 22 Jun 2021 15:09:13 +0000 From: Colin King To: Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Ben Gardon , kvm@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][next] KVM: x86/mmu: Fix uninitialized boolean variable flush Date: Tue, 22 Jun 2021 16:09:12 +0100 Message-Id: <20210622150912.23429-1-colin.king@canonical.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Colin Ian King In the case where kvm_memslots_have_rmaps(kvm) is false the boolean variable flush is not set and is uninitialized. If is_tdp_mmu_enabled(kvm) is true then the call to kvm_tdp_mmu_zap_collapsible_sptes passes the uninitialized value of flush into the call. Fix this by initializing flush to false. Addresses-Coverity: ("Uninitialized scalar variable") Fixes: e2209710ccc5 ("KVM: x86/mmu: Skip rmap operations if rmaps not allocated") Signed-off-by: Colin Ian King Reviewed-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index ed24e97c1549..b8d20f139729 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -5689,7 +5689,7 @@ void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm, { /* FIXME: const-ify all uses of struct kvm_memory_slot. */ struct kvm_memory_slot *slot = (struct kvm_memory_slot *)memslot; - bool flush; + bool flush = false; if (kvm_memslots_have_rmaps(kvm)) { write_lock(&kvm->mmu_lock);