linux-kernel - [PATCH 1/3] KVM: x86: Gracefully handle __vmalloc() failure during VM allocation

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Date:   Sun, 26 Jan 2020 16:41:11 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] KVM: x86: Gracefully handle __vmalloc() failure during VM allocation

Check the result of __vmalloc() to avoid dereferencing a NULL pointer in
the event that allocation failres.

Fixes: 40bbb9d03f05d ("KVM: VMX: add struct kvm_vmx to hold VMX specific KVM vars")
Fixes: 81811c162d4da ("KVM: SVM: add struct kvm_svm to hold SVM specific KVM vars")
Fixes: d1e5b0e98ea27 ("kvm: Make VM ioctl do valloc for some archs")
Cc: stable@...r.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/svm.c     | 4 ++++
 arch/x86/kvm/vmx/vmx.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index bf0556588ad0..6565257dea39 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1951,6 +1951,10 @@ static struct kvm *svm_vm_alloc(void)
 	struct kvm_svm *kvm_svm = __vmalloc(sizeof(struct kvm_svm),
 					    GFP_KERNEL_ACCOUNT | __GFP_ZERO,
 					    PAGE_KERNEL);
+
+	if (!kvm_svm)
+		return NULL;
+
 	return &kvm_svm->kvm;
 }
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 1419c53aed16..45f3f215e9df 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6662,6 +6662,10 @@ static struct kvm *vmx_vm_alloc(void)
 	struct kvm_vmx *kvm_vmx = __vmalloc(sizeof(struct kvm_vmx),
 					    GFP_KERNEL_ACCOUNT | __GFP_ZERO,
 					    PAGE_KERNEL);
+
+	if (!kvm_vmx)
+		return NULL;
+
 	return &kvm_vmx->kvm;
 }
 
-- 
2.24.1