linux-kernel - Re: [PATCH v3] KVM: remove buggy vcpu id check on vcpu creation

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Message-ID: <20160420172706.GA4044@potion>
Date:	Wed, 20 Apr 2016 19:27:06 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	James Hogan <james.hogan@...tec.com>
Cc:	Greg Kurz <gkurz@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>, mingo@...hat.com,
	linux-mips@...ux-mips.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, qemu-ppc@...gnu.org,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Paul Mackerras <paulus@...ba.org>,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH v3] KVM: remove buggy vcpu id check on vcpu creation

2016-04-20 18:09+0100, James Hogan:
> On Wed, Apr 20, 2016 at 07:02:10PM +0200, Radim Krčmář wrote:
>> 2016-04-20 17:44+0200, Greg Kurz:
>> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
>> > index 70ef1a43c114..0278ea146db5 100644
>> > --- a/arch/mips/kvm/mips.c
>> > +++ b/arch/mips/kvm/mips.c
>> > @@ -248,9 +248,14 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
>> >  	int err, size, offset;
>> >  	void *gebase;
>> >  	int i;
>> > +	struct kvm_vcpu *vcpu;
>> >  
>> > -	struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
>> > +	if (id >= KVM_MAX_VCPUS) {
>> > +		err = -EINVAL;
>> > +		goto out;
>> 
>> 'vcpu' looks undefined at this point, so kfree in 'out:' may bug.
> 
> Thats out_free_cpu I think?

My bad, it is.  Thank you!