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KVM: x86: fix memoryleak in kvm_arch_vcpu_create()

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When allocating memory for mci_ctl2_banks fails, KVM doesn't release
mce_banks leading to memoryleak. Fix this issue by calling kfree()
for it when kcalloc() fails.

Fixes: 281b52780b ("KVM: x86: Add emulation for MSR_IA32_MCx_CTL2 MSRs.")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Message-Id: <20220901122300.22298-1-linmiaohe@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Miaohe Lin 2022-09-01 20:23:00 +08:00 committed by Paolo Bonzini
parent 0204750bd4
commit 3c0ba05ce9
1 changed files with 1 additions and 2 deletions
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3
arch/x86/kvm/x86.c
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@ -11580,7 +11580,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
vcpu->arch.mci_ctl2_banks = kcalloc(KVM_MAX_MCE_BANKS, sizeof(u64),
GFP_KERNEL_ACCOUNT);
if (!vcpu->arch.mce_banks || !vcpu->arch.mci_ctl2_banks)
goto fail_free_pio_data;
goto fail_free_mce_banks;
vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask,
@ -11634,7 +11634,6 @@ free_wbinvd_dirty_mask:
fail_free_mce_banks:
kfree(vcpu->arch.mce_banks);
kfree(vcpu->arch.mci_ctl2_banks);
fail_free_pio_data:
free_page((unsigned long)vcpu->arch.pio_data);
fail_free_lapic:
kvm_free_lapic(vcpu);