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KVM: s390: prevent buffer overrun on memory hotplug during migration
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>
Cc: stable@vger.kernel.org # 4.13+
Fixes: 190df4a212
(KVM: s390: CMMA tracking, ESSA emulation, migration mode)
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
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1 changed files with 1 additions and 1 deletions
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@ -1006,7 +1006,7 @@ static inline int do_essa(struct kvm_vcpu *vcpu, const int orc)
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cbrlo[entries] = gfn << PAGE_SHIFT;
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}
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if (orc) {
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if (orc && gfn < ms->bitmap_size) {
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/* increment only if we are really flipping the bit to 1 */
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if (!test_and_set_bit(gfn, ms->pgste_bitmap))
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atomic64_inc(&ms->dirty_pages);
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