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KVM: x86/mmu: Fix uninitialized boolean variable flush 

In the case where kvm_memslots_have_rmaps(kvm) is false the boolean
variable flush is not set and is uninitialized.  If is_tdp_mmu_enabled(kvm)
is true then the call to kvm_tdp_mmu_zap_collapsible_sptes passes the
uninitialized value of flush into the call. Fix this by initializing
flush to false.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: e2209710cc ("KVM: x86/mmu: Skip rmap operations if rmaps not allocated")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622150912.23429-1-colin.king@canonical.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Colin Ian King 2021-06-22 16:09:12 +01:00 committed by Paolo Bonzini
parent e5830fb13b
commit 31c6565700
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu/mmu.c
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@ -5689,7 +5689,7 @@ void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
{
/* FIXME: const-ify all uses of struct kvm_memory_slot. */
struct kvm_memory_slot *slot = (struct kvm_memory_slot *)memslot;
bool flush;
bool flush = false;
if (kvm_memslots_have_rmaps(kvm)) {
write_lock(&kvm->mmu_lock);