linux-kernel - Re: [PATCH v3] KVM: x86: fix for missing initialization of return status variable

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Message-ID: <20211206172746.GA141396@hamza-OptiPlex-7040>
Date:   Mon, 6 Dec 2021 22:27:46 +0500
From:   Ameer Hamza <amhamza.mgc@...il.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     vkuznets@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com
Subject: Re: [PATCH v3] KVM: x86: fix for missing initialization of return
 status variable

On Mon, Dec 06, 2021 at 05:02:01PM +0000, Sean Christopherson wrote:
> On Mon, Dec 06, 2021, Ameer Hamza wrote:
> > If undefined ioctl number is passed to the kvm_vcpu_ioctl_device_attr
> > ioctl, we should trigger KVM_BUG_ON() and return with EIO to silent
> > coverity warning.
> > 
> > Addresses-Coverity: 1494124 ("Uninitialized scalar variable")
> > Signed-off-by: Ameer Hamza <amhamza.mgc@...il.com>
> > ---
> > Changes in v3:
> > Added KVM_BUG_ON() as default case and returned -EIO
> > ---
> >  arch/x86/kvm/x86.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index e0aa4dd53c7f..b37068f847ff 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -5019,6 +5019,9 @@ static int kvm_vcpu_ioctl_device_attr(struct kvm_vcpu *vcpu,
> >  	case KVM_SET_DEVICE_ATTR:
> >  		r = kvm_arch_tsc_set_attr(vcpu, &attr);
> >  		break;
> > +	default:
> > +		KVM_BUG_ON(1, vcpu->kvm);
> > +		r = -EIO;
> 
> At least have a
> 
> 		break;
> 
> if we're going to be pedantic about things.
I just started as a contributer in this community and trying
to fix issues found by static analyzer tools. If you think that's
not necessary, its totally fine :)

> >  	}
> >  
> >  	return r;
> > -- 
> > 2.25.1
> >