[PATCH v7 03/14] KVM: s390: Fix kvm_s390_vcpu_unsetup_cmma()
Claudio Imbrenda <[email protected]>
| Newsgroups | org.kernel.vger.linux-s390,org.kernel.vger.kvm,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
In some cases kvm_s390_vcpu_unsetup_cmma() can be called with a 0
cbrlo; in such cases, if running with V != R, free_page() will attempt
to free physical page 0.
Fix by freeing cbrlo only if it's non-zero.
Fixes: b31605c12f4e ("KVM: s390: make cmma usage conditionally")
Fixes: 29b40f105ec8 ("KVM: s390: protvirt: Add initial vm and cpu lifecycle handling")
Signed-off-by: Claudio Imbrenda <[email protected]>
---
arch/s390/kvm/kvm-s390.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 1b3290a5ad1a..9be27db0a21e 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3678,7 +3678,8 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
{
- free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo));
+ if (vcpu->arch.sie_block->cbrlo)
+ free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo));
vcpu->arch.sie_block->cbrlo = 0;
}
--
2.55.0