From 8e41bd54317b04f2bf03012a4ca8ab7360c9beef Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 4 Oct 2018 14:42:43 +0200 Subject: KVM: s390: fix locking for crypto setting error path We need to unlock the kvm->lock mutex in the error case. Reported-by: smatch Fixes: 37940fb0b6a2c4bf101 ("KVM: s390: device attrs to enable/disable AP interpretation") Signed-off-by: Christian Borntraeger Reviewed-by: Janosch Frank Reviewed-by: Pierre Morel Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- arch/s390/kvm/kvm-s390.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'arch/s390/kvm/kvm-s390.c') diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index a6230b00c1df..734d87d88eb3 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -859,8 +859,10 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) mutex_lock(&kvm->lock); switch (attr->attr) { case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: - if (!test_kvm_facility(kvm, 76)) + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); return -EINVAL; + } get_random_bytes( kvm->arch.crypto.crycb->aes_wrapping_key_mask, sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); @@ -868,8 +870,10 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); break; case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: - if (!test_kvm_facility(kvm, 76)) + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); return -EINVAL; + } get_random_bytes( kvm->arch.crypto.crycb->dea_wrapping_key_mask, sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); @@ -877,16 +881,20 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); break; case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: - if (!test_kvm_facility(kvm, 76)) + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); return -EINVAL; + } kvm->arch.crypto.aes_kw = 0; memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); break; case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: - if (!test_kvm_facility(kvm, 76)) + if (!test_kvm_facility(kvm, 76)) { + mutex_unlock(&kvm->lock); return -EINVAL; + } kvm->arch.crypto.dea_kw = 0; memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); -- cgit v1.2.3