KVM: attempt async pf only if address is contained in vma

[Marcelo Tosatti <mtosatti@xxxxxxxxxx>]

Only attempt async pagefault if address is contained within vma.

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5d57ec9..a9cfbd2 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -996,8 +996,9 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
 
 		if (vma == NULL || addr < vma->vm_start ||
 		    !(vma->vm_flags & VM_PFNMAP)) {
-			if (async && !(vma->vm_flags & VM_PFNMAP) &&
-			    (vma->vm_flags & VM_WRITE))
+			if (async && vma && !(vma->vm_flags & VM_PFNMAP) &&
+			    (vma->vm_flags & VM_WRITE) &&
+			    addr >= vma->vm_start)
 				*async = true;
 			up_read(&current->mm->mmap_sem);
 return_fault_page:
--
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