From e5610fce4a41f90092714b6eb4b12f107a74b494 Mon Sep 17 00:00:00 2001 From: Carsten Otte Date: Tue, 18 Oct 2011 12:27:12 +0200 Subject: [PATCH] KVM: s390: check cpu_id prior to using it 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 Signed-off-by: Christian Borntraeger Signed-off-by: Marcelo Tosatti Signed-off-by: Paul Gortmaker --- arch/s390/kvm/kvm-s390.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index ee7c713686ce..a6015d1e06c4 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -311,11 +311,17 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *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); @@ -350,7 +356,7 @@ out_free_sie_block: free_page((unsigned long)(vcpu->arch.sie_block)); out_free_cpu: kfree(vcpu); -out_nomem: +out: return ERR_PTR(rc); } -- 2.39.5