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>
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@ -1434,11 +1434,17 @@ kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
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{
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unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
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if (addr == KVM_HVA_ERR_RO_BAD)
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if (addr == KVM_HVA_ERR_RO_BAD) {
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if (writable)
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*writable = false;
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return KVM_PFN_ERR_RO_FAULT;
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}
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if (kvm_is_error_hva(addr))
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if (kvm_is_error_hva(addr)) {
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if (writable)
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*writable = false;
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return KVM_PFN_NOSLOT;
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}
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/* Do not map writable pfn in the readonly memslot. */
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if (writable && memslot_is_readonly(slot)) {
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