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KVM: Fix kvm_clear_dirty_log_protect off-by-(minus-)one 

Just imaging the case where num_pages < BITS_PER_LONG, then the loop
will be skipped while it shouldn't.

Signed-off-by: Peter Xu <peterx@redhat.com>
Fixes: 2a31b9db15
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2019-05-08 17:15:46 +08:00 committed by Paolo Bonzini
parent 4ddc920457
commit 53eac7a8f8
1 changed files with 2 additions and 2 deletions
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4
virt/kvm/kvm_main.c
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@ -1264,8 +1264,8 @@ int kvm_clear_dirty_log_protect(struct kvm *kvm,
return -EFAULT;
spin_lock(&kvm->mmu_lock);
for (offset = log->first_page,
i = offset / BITS_PER_LONG, n = log->num_pages / BITS_PER_LONG; n--;
for (offset = log->first_page, i = offset / BITS_PER_LONG,
n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--;
i++, offset += BITS_PER_LONG) {
unsigned long mask = *dirty_bitmap_buffer++;
atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i];