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

[Marcelo Tosatti]

Only attempt async pagefault if address is contained within vma.

Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>

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:
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html