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| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-02-23 15:36:01 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-04 12:35:20 +0100 |
| commit | b2740d3533a3f4aeb9553e872ce471ff73200a7f (patch) | |
| tree | 6b24a81ae92244539c9ff8cc9f0078a5f6c88f0b /virt/kvm | |
| parent | 107d44a2c5bf08f221cb406b776310f12084e4de (diff) | |
| download | linux-b2740d3533a3f4aeb9553e872ce471ff73200a7f.tar.gz linux-b2740d3533a3f4aeb9553e872ce471ff73200a7f.tar.bz2 linux-b2740d3533a3f4aeb9553e872ce471ff73200a7f.zip | |
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.c | 10 |
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)) { |