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Message-Id: <5ddb7c97d2f1edbd000020aa842b0619374e6951.1665975828.git.houwenlong.hwl@antgroup.com>
Date: Mon, 17 Oct 2022 11:06:09 +0800
From: "Hou Wenlong" <houwenlong.hwl@...group.com>
To: kvm@...r.kernel.org
Cc: Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>, Peter Xu <peterx@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] KVM: x86: Reduce refcount if single_open() fails in kvm_mmu_rmaps_stat_open()
Refcount is increased before calling single_open() in
kvm_mmu_rmaps_stat_open(), If single_open() fails, refcount should be
restored, otherwise the vm couldn't be destroyed.
Fixes: 3bcd0662d66fd ("KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file")
Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
---
arch/x86/kvm/debugfs.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c
index cfed36aba2f7..e6efd0821c59 100644
--- a/arch/x86/kvm/debugfs.c
+++ b/arch/x86/kvm/debugfs.c
@@ -157,12 +157,17 @@ static int kvm_mmu_rmaps_stat_show(struct seq_file *m, void *v)
static int kvm_mmu_rmaps_stat_open(struct inode *inode, struct file *file)
{
+ int ret;
struct kvm *kvm = inode->i_private;
if (!kvm_get_kvm_safe(kvm))
return -ENOENT;
- return single_open(file, kvm_mmu_rmaps_stat_show, kvm);
+ ret = single_open(file, kvm_mmu_rmaps_stat_show, kvm);
+ if (ret)
+ kvm_put_kvm(kvm);
+
+ return ret;
}
static int kvm_mmu_rmaps_stat_release(struct inode *inode, struct file *file)
--
2.31.1
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