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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>
This commit is contained in:
Thomas Huth 2014-03-20 13:20:46 +01:00 committed by Christian Borntraeger
parent 609433fbed
commit 91880d07fc
1 changed files with 6 additions and 8 deletions
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14
arch/s390/kvm/sigp.c
View File

@ -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);