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Date:   Sat, 15 Feb 2020 05:02:29 +0800
From:   Haiwei Li <lihaiwei.kernel@...il.com>
To:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: [PATCH] KVM: Add the check and free to avoid unknown errors.

From: Haiwei Li <lihaiwei@...cent.com>

If 'kvm_create_vm_debugfs()' fails in 'kzalloc(sizeof(*stat_data), ...)',
'kvm_destroy_vm_debugfs()' will be called by the final fput(file) in
'kvm_dev_ioctl_create_vm()'.

Add the check and free to avoid unknown errors.

Signed-off-by: Haiwei Li <lihaiwei@...cent.com>
---
  virt/kvm/kvm_main.c | 5 ++++-
  1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 67ae2d5..18a32e1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -617,8 +617,11 @@ static void kvm_destroy_vm_debugfs(struct kvm *kvm)
  	debugfs_remove_recursive(kvm->debugfs_dentry);

  	if (kvm->debugfs_stat_data) {
-		for (i = 0; i < kvm_debugfs_num_entries; i++)
+		for (i = 0; i < kvm_debugfs_num_entries; i++) {
+			if (!kvm->debugfs_stat_data[i])
+				break;
  			kfree(kvm->debugfs_stat_data[i]);
+		}
  		kfree(kvm->debugfs_stat_data);
  	}
  }
--
1.8.3.1

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