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KVM: x86: avoid uninitialized variable warning

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This does not show up on all compiler versions, so it sneaked into the
first 4.3 pull request.  The fix is to mimic the logic of the "print
sptes" loop in the "fill array" loop.  Then leaf and root can be
both initialized unconditionally.

Note that "leaf" now points to the first unused element of the array,
not the last filled element.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-09-06 16:24:50 +02:00
parent 4e33d1f0a1
commit 29ecd66019
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kvm/mmu.c
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@ -3309,13 +3309,14 @@ walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr, u64 *sptep)
walk_shadow_page_lockless_begin(vcpu);
for (shadow_walk_init(&iterator, vcpu, addr), root = iterator.level;
for (shadow_walk_init(&iterator, vcpu, addr),
leaf = root = iterator.level;
shadow_walk_okay(&iterator);
__shadow_walk_next(&iterator, spte)) {
leaf = iterator.level;
spte = mmu_spte_get_lockless(iterator.sptep);
sptes[leaf - 1] = spte;
leaf--;
if (!is_shadow_present_pte(spte))
break;
@ -3329,7 +3330,7 @@ walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr, u64 *sptep)
if (reserved) {
pr_err("%s: detect reserved bits on spte, addr 0x%llx, dump hierarchy:\n",
__func__, addr);
while (root >= leaf) {
while (root > leaf) {
pr_err("------ spte 0x%llx level %d.\n",
sptes[root - 1], root);
root--;