memory: assert that PhysPageEntry's ptr does not overflow
While sized to 15 bits in PhysPageEntry, the ptr field is ORed into the iotlb entries together with a page-aligned pointer. The ptr field must not overflow into this page-aligned value, assert that it is smaller than the page size. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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6
exec.c
6
exec.c
@ -713,6 +713,12 @@ static void destroy_all_mappings(AddressSpaceDispatch *d)
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static uint16_t phys_section_add(MemoryRegionSection *section)
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{
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/* The physical section number is ORed with a page-aligned
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* pointer to produce the iotlb entries. Thus it should
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* never overflow into the page-aligned value.
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*/
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assert(phys_sections_nb < TARGET_PAGE_SIZE);
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if (phys_sections_nb == phys_sections_nb_alloc) {
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phys_sections_nb_alloc = MAX(phys_sections_nb_alloc * 2, 16);
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phys_sections = g_renew(MemoryRegionSection, phys_sections,
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