linux-kernel - [PATCH 3.13 037/259] MIPS: KVM: Fix memory leak on VCPU

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Date:	Fri,  8 Aug 2014 13:37:40 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Deng-Cheng Zhu <dengcheng.zhu@...tec.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 037/259] MIPS: KVM: Fix memory leak on VCPU

3.13.11.6 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Deng-Cheng Zhu <dengcheng.zhu@...tec.com>

commit 8c9eb041cf76038eb3b62ee259607eec9b89f48d upstream.

kvm_arch_vcpu_free() is called in 2 code paths:

1) kvm_vm_ioctl()
       kvm_vm_ioctl_create_vcpu()
           kvm_arch_vcpu_destroy()
               kvm_arch_vcpu_free()
2) kvm_put_kvm()
       kvm_destroy_vm()
           kvm_arch_destroy_vm()
               kvm_mips_free_vcpus()
                   kvm_arch_vcpu_free()

Neither of the paths handles VCPU free. We need to do it in
kvm_arch_vcpu_free() corresponding to the memory allocation in
kvm_arch_vcpu_create().

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@...tec.com>
Reviewed-by: James Hogan <james.hogan@...tec.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/mips/kvm/kvm_mips.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c
index 3dfbe82..7a8b440 100644
--- a/arch/mips/kvm/kvm_mips.c
+++ b/arch/mips/kvm/kvm_mips.c
@@ -395,6 +395,7 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
 	if (vcpu->arch.kseg0_commpage)
 		kfree(vcpu->arch.kseg0_commpage);
 
+	kfree(vcpu);
 }
 
 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
-- 
1.9.1

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