[kvm-commits] [PATCH] KVM: Fix unbalanced mmap_sem operations in cmpxchg8b emulation

[Avi Kivity]

From: Avi Kivity <[EMAIL PROTECTED]>

Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0b11b7f..c5b4825 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1758,9 +1758,9 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
                set_64bit((u64 *)(addr + offset_in_page(gpa)), val);
                kunmap_atomic(addr, KM_USER0);
                kvm_release_page_dirty(page);
+       emul_write:
+               up_read(&current->mm->mmap_sem);
        }
-emul_write:
-       up_read(&current->mm->mmap_sem);
 #endif
 
        return emulator_write_emulated(addr, new, bytes, vcpu);

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