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| author |   Hou Wenlong <houwenlong.hwl@antgroup.com> | 2022-10-14 15:55:11 +0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-10-27 04:41:54 -0400 |
| commit | 5aa02366773376a1fd3a5c6a815e5f6e026ab391 (patch) | |
| tree | 31bdbb0d36548f7fe84e6062f27c0e7de0f09a88 /arch/x86/kvm/debugfs.c | |
| parent | KVM: x86: Mask off reserved bits in CPUID.8000001FH (diff) | |
| download | linux-dev-5aa02366773376a1fd3a5c6a815e5f6e026ab391.tar.xz linux-dev-5aa02366773376a1fd3a5c6a815e5f6e026ab391.zip | |
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@antgroup.com>
Message-Id: <a75900413bb8b1e556be690e9588a0f92e946a30.1665733883.git.houwenlong.hwl@antgroup.com>
[Preserved return value of single_open. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/debugfs.c')
| -rw-r--r-- | arch/x86/kvm/debugfs.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c index cfed36aba2f7..c1390357126a 100644 --- a/arch/x86/kvm/debugfs.c +++ b/arch/x86/kvm/debugfs.c @@ -158,11 +158,16 @@ out: static int kvm_mmu_rmaps_stat_open(struct inode *inode, struct file *file) { struct kvm *kvm = inode->i_private; + int r; if (!kvm_get_kvm_safe(kvm)) return -ENOENT; - return single_open(file, kvm_mmu_rmaps_stat_show, kvm); + r = single_open(file, kvm_mmu_rmaps_stat_show, kvm); + if (r < 0) + kvm_put_kvm(kvm); + + return r; } static int kvm_mmu_rmaps_stat_release(struct inode *inode, struct file *file) |