linux-kernel - [PATCH] kvm: x86: mmu: fix memoryleak in kvm_mmu_vendor_module

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Message-ID: <20220823063237.47299-1-linmiaohe@huawei.com>
Date:   Tue, 23 Aug 2022 14:32:37 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <seanjc@...gle.com>, <pbonzini@...hat.com>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC:     <x86@...nel.org>, <hpa@...or.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH] kvm: x86: mmu: fix memoryleak in kvm_mmu_vendor_module_init()

When register_shrinker() fails, we forgot to release the percpu counter
kvm_total_used_mmu_pages leading to memoryleak. Fix this issue by calling
percpu_counter_destroy() when register_shrinker() fails.

Fixes: ab271bd4dfd5 ("x86: kvm: propagate register_shrinker return code")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 arch/x86/kvm/mmu/mmu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index e418ef3ecfcb..d25d55b1f0b5 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6702,10 +6702,12 @@ int kvm_mmu_vendor_module_init(void)
 
 	ret = register_shrinker(&mmu_shrinker, "x86-mmu");
 	if (ret)
-		goto out;
+		goto out_shrinker;
 
 	return 0;
 
+out_shrinker:
+	percpu_counter_destroy(&kvm_total_used_mmu_pages);
 out:
 	mmu_destroy_caches();
 	return ret;
-- 
2.23.0