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KVM: s390: Fix kvm_s390_vcpu_unsetup_cmma()

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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: b31605c12f ("KVM: s390: make cmma usage conditionally")
Fixes: 29b40f105e ("KVM: s390: protvirt: Add initial vm and cpu lifecycle handling")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260803124040.126471-4-imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2026-08-03 14:40:30 +02:00
parent f8e370058e
commit b050f741fd
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kvm/kvm-s390.c
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@ -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;
}