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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id 2sm2868252wmk.24.2021.06.22.09.43.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 22 Jun 2021 09:43:18 -0700 (PDT) Subject: Re: [PATCH][next] KVM: x86/mmu: Fix uninitialized boolean variable flush To: Colin King , 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 References: <20210622150912.23429-1-colin.king@canonical.com> From: Paolo Bonzini Message-ID: <7a8f9ef7-03f7-08e3-61b2-548aa54328e3@redhat.com> Date: Tue, 22 Jun 2021 18:43:17 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210622150912.23429-1-colin.king@canonical.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 22/06/21 17:09, Colin King wrote: > 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 > --- > 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); > Queued, thanks. Paolo