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authorPaolo Bonzini <pbonzini@redhat.com>2016-02-23 15:36:01 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2016-03-04 12:35:20 +0100
commitb2740d3533a3f4aeb9553e872ce471ff73200a7f (patch)
tree6b24a81ae92244539c9ff8cc9f0078a5f6c88f0b /virt/kvm
parent107d44a2c5bf08f221cb406b776310f12084e4de (diff)
downloadlinux-b2740d3533a3f4aeb9553e872ce471ff73200a7f.tar.gz
KVM: ensure __gfn_to_pfn_memslot initializes *writable
For the kvm_is_error_hva, ubsan complains if the uninitialized writable is passed to __direct_map, even though the value itself is not used (__direct_map goes to mmu_set_spte->set_spte->set_mmio_spte but never looks at that argument). Ensuring that __gfn_to_pfn_memslot initializes *writable is cheap and avoids this kind of issue. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 39c36d4f4f5c..1eae05236347 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1434,11 +1434,17 @@ kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
{
unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
- if (addr == KVM_HVA_ERR_RO_BAD)
+ if (addr == KVM_HVA_ERR_RO_BAD) {
+ if (writable)
+ *writable = false;
return KVM_PFN_ERR_RO_FAULT;
+ }
- if (kvm_is_error_hva(addr))
+ if (kvm_is_error_hva(addr)) {
+ if (writable)
+ *writable = false;
return KVM_PFN_NOSLOT;
+ }
/* Do not map writable pfn in the readonly memslot. */
if (writable && memslot_is_readonly(slot)) {