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KVM: x86/mmu: fix memoryleak in kvm_mmu_vendor_module_init() 

When register_shrinker() fails, KVM doesn't 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: ab271bd4df ("x86: kvm: propagate register_shrinker return code")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Link: https://lore.kernel.org/r/20220823063237.47299-1-linmiaohe@huawei.com
[sean: tweak shortlog and changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Miaohe Lin 2022-08-23 14:32:37 +08:00 committed by Sean Christopherson
parent 6aa5c47c35
commit d7c9bfb9ca
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/mmu/mmu.c
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@ -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;