Commit 4ddc9204 authored May 08, 2019 by Peter Xu Committed by Paolo Bonzini May 08, 2019

KVM: Fix the bitmap range to copy during clear dirty



kvm_dirty_bitmap_bytes() will return the size of the dirty bitmap of
the memslot rather than the size of bitmap passed over from the ioctl.
Here for KVM_CLEAR_DIRTY_LOG we should only copy exactly the size of
bitmap that covers kvm_clear_dirty_log.num_pages.

Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 2a31b9db
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent e9c16c78

virt/kvm/kvm_main.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1251,7 +1251,7 @@ int kvm_clear_dirty_log_protect(struct kvm *kvm,
		if (!dirty_bitmap)
		return -ENOENT;

		n = kvm_dirty_bitmap_bytes(memslot);
		n = ALIGN(log->num_pages, BITS_PER_LONG) / 8;

		if (log->first_page > memslot->npages \|\|
		log->num_pages > memslot->npages - log->first_page \|\|

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