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| author | Thomas Huth <thuth@linux.vnet.ibm.com> | 2014-03-20 13:20:46 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-03-25 13:27:11 +0100 |
| commit | 91880d07fc9b2b6b7a726765039897af99d9ca78 (patch) | |
| tree | ac9073770af435f86dfc8f8dc616dae436aaff5a | |
| parent | 609433fbed4f25e11e8b058ab7e9478b212879a9 (diff) | |
| download | op-kernel-dev-91880d07fc9b2b6b7a726765039897af99d9ca78.zip op-kernel-dev-91880d07fc9b2b6b7a726765039897af99d9ca78.tar.gz | |
KVM: s390: Fix possible memory leak in SIGP functions
When kvm_get_vcpu() returned NULL for the destination CPU in
__sigp_emergency() or __sigp_external_call(), the memory for the
"inti" structure was not released anymore. This patch fixes this
issue by moving the check for !dst_vcpu before the kzalloc() call.
Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
| -rw-r--r-- | arch/s390/kvm/sigp.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c index 3fe44c4..26caeb5 100644 --- a/arch/s390/kvm/sigp.c +++ b/arch/s390/kvm/sigp.c @@ -58,7 +58,9 @@ static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) struct kvm_s390_interrupt_info *inti; struct kvm_vcpu *dst_vcpu = NULL; - if (cpu_addr >= KVM_MAX_VCPUS) + if (cpu_addr < KVM_MAX_VCPUS) + dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); + if (!dst_vcpu) return SIGP_CC_NOT_OPERATIONAL; inti = kzalloc(sizeof(*inti), GFP_KERNEL); @@ -68,9 +70,6 @@ static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr) inti->type = KVM_S390_INT_EMERGENCY; inti->emerg.code = vcpu->vcpu_id; - dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); - if (!dst_vcpu) - return SIGP_CC_NOT_OPERATIONAL; li = &dst_vcpu->arch.local_int; spin_lock_bh(&li->lock); list_add_tail(&inti->list, &li->list); @@ -121,7 +120,9 @@ static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr) struct kvm_s390_interrupt_info *inti; struct kvm_vcpu *dst_vcpu = NULL; - if (cpu_addr >= KVM_MAX_VCPUS) + if (cpu_addr < KVM_MAX_VCPUS) + dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); + if (!dst_vcpu) return SIGP_CC_NOT_OPERATIONAL; inti = kzalloc(sizeof(*inti), GFP_KERNEL); @@ -131,9 +132,6 @@ static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr) inti->type = KVM_S390_INT_EXTERNAL_CALL; inti->extcall.code = vcpu->vcpu_id; - dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr); - if (!dst_vcpu) - return SIGP_CC_NOT_OPERATIONAL; li = &dst_vcpu->arch.local_int; spin_lock_bh(&li->lock); list_add_tail(&inti->list, &li->list); |
