KVM: s390: prevent buffer overrun on memory hotplug during migration

commit c2cf265d860882b51a200e4a7553c17827f2b730 upstream.

We must not go beyond the pre-allocated buffer. This can happen when
a new memory slot is added during migration.

Reported-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: 190df4a212a7 (KVM: s390: CMMA tracking, ESSA emulation, migration mode)
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 5b25287f449b7e6fd919f673f110917a7376e74c..7bd3a59232f01461d3f6ee4d8a5ead6524c77d2a 100644 (file)
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -1009,7 +1009,7 @@ static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
                cbrlo[entries] = gfn << PAGE_SHIFT;
        }
 
-       if (orc) {
+       if (orc && gfn < ms->bitmap_size) {
                /* increment only if we are really flipping the bit to 1 */
                if (!test_and_set_bit(gfn, ms->pgste_bitmap))
                        atomic64_inc(&ms->dirty_pages);