| Date | Wed, 09 Nov 2011 13:32:57 -0800 | From | Greg KH <> | Subject | [130/264] KVM: s390: check cpu_id prior to using it |
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3.1-stable review patch. If anyone has any objections, please let me know.
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From: Carsten Otte <cotte@de.ibm.com>
commit 4d47555a80495657161a7e71ec3014ff2021e450 upstream.
We use the cpu id provided by userspace as array index here. Thus we clearly need to check it first. Ooops.
Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- arch/s390/kvm/kvm-s390.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
--- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -312,11 +312,17 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) { - struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); - int rc = -ENOMEM; + struct kvm_vcpu *vcpu; + int rc = -EINVAL; + if (id >= KVM_MAX_VCPUS) + goto out; + + rc = -ENOMEM; + + vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL); if (!vcpu) - goto out_nomem; + goto out; vcpu->arch.sie_block = (struct kvm_s390_sie_block *) get_zeroed_page(GFP_KERNEL); @@ -352,7 +358,7 @@ out_free_sie_block: free_page((unsigned long)(vcpu->arch.sie_block)); out_free_cpu: kfree(vcpu); -out_nomem: +out: return ERR_PTR(rc); }
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