From: linmiaohe <linmiaohe@huawei.com>
To: <pbonzini@redhat.com>, <rkrcmar@redhat.com>,
<sean.j.christopherson@intel.com>, <vkuznets@redhat.com>,
<wanpengli@tencent.com>, <jmattson@google.com>, <joro@8bytes.org>,
<tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
<hpa@zytor.com>
Cc: <linmiaohe@huawei.com>, <kvm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<liran.alon@oracle.com>
Subject: [PATCH v2] KVM: SVM: Fix potential memory leak in svm_cpu_init()
Date: Sat, 4 Jan 2020 16:56:49 +0800 [thread overview]
Message-ID: <1578128209-12891-1-git-send-email-linmiaohe@huawei.com> (raw)
From: Miaohe Lin <linmiaohe@huawei.com>
When kmalloc memory for sd->sev_vmcbs failed, we forget to free the page
held by sd->save_area. Also get rid of the var r as '-ENOMEM' is actually
the only possible outcome here.
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
-v2:
drop var r as suggested by Vitaly
---
arch/x86/kvm/svm.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8f1b715dfde8..5f9d6547e0e7 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1003,33 +1003,32 @@ static void svm_cpu_uninit(int cpu)
static int svm_cpu_init(int cpu)
{
struct svm_cpu_data *sd;
- int r;
sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
if (!sd)
return -ENOMEM;
sd->cpu = cpu;
- r = -ENOMEM;
sd->save_area = alloc_page(GFP_KERNEL);
if (!sd->save_area)
- goto err_1;
+ goto free_cpu_data;
if (svm_sev_enabled()) {
- r = -ENOMEM;
sd->sev_vmcbs = kmalloc_array(max_sev_asid + 1,
sizeof(void *),
GFP_KERNEL);
if (!sd->sev_vmcbs)
- goto err_1;
+ goto free_save_area;
}
per_cpu(svm_data, cpu) = sd;
return 0;
-err_1:
+free_save_area:
+ __free_page(sd->save_area);
+free_cpu_data:
kfree(sd);
- return r;
+ return -ENOMEM;
}
--
2.19.1
next reply other threads:[~2020-01-04 8:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-04 8:56 linmiaohe [this message]
2020-01-15 18:23 ` [PATCH v2] KVM: SVM: Fix potential memory leak in svm_cpu_init() Paolo Bonzini
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