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KVM: s390: Do not free SCA if it was not allocated

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If VM creation fails early in kvm_arch_init_vm(), the cleanup code
tries to free up the SCA, even though the address is 0. Due to using
free_pages_exact(), only the first page is skipped, accidentally
freeing pages 1, 2, and 3.

Fix by checking whether the pointer is NULL before attempting to free
the SCA in sca_dispose().

Fixes: e72753ed12 ("KVM: s390: Use ESCA instead of BSCA at VM init")
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260803124040.126471-3-imbrenda@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda
2026-08-03 14:40:29 +02:00
parent 496e0f706b
commit f8e370058e
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kvm/kvm-s390.c
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@@ -3247,7 +3247,8 @@ static void kvm_s390_crypto_init(struct kvm *kvm)
static void sca_dispose(struct kvm *kvm)
{
free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca));
if (kvm->arch.sca)
free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca));
kvm->arch.sca = NULL;
}