linux-kernel - Re: [PATCH][next] KVM: x86/mmu: Fix uninitialized boolean variable flush

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Message-ID: <YNISAXXPWnhJlurO@google.com>
Date:   Tue, 22 Jun 2021 16:38:25 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Ben Gardon <bgardon@...gle.com>, kvm@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] KVM: x86/mmu: Fix uninitialized boolean variable
 flush

On Tue, Jun 22, 2021, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> 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 <colin.king@...onical.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>