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Kernel: Propagate overflow errors from Memory::page_round_up

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Fixes #11402.
This commit is contained in:
Guilherme Goncalves 2021-12-24 11:22:11 -03:00 • committed by Andreas Kling
parent 11599a3342
commit 33b78915d3
31 changed files with 112 additions and 100 deletions
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12
Kernel/Bus/PCI/Access.cpp
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@ -59,7 +59,17 @@ UNMAP_AFTER_INIT bool Access::search_pci_domains_from_acpi_mcfg_table(PhysicalAd
dbgln("PCI: MCFG, length: {}, revision: {}", length, revision);
auto mcfg_region_or_error = MM.allocate_kernel_region(mcfg_table.page_base(), Memory::page_round_up(length) + PAGE_SIZE, "PCI Parsing MCFG", Memory::Region::Access::ReadWrite);
if (Checked<size_t>::addition_would_overflow(length, PAGE_SIZE)) {
dbgln("Overflow when adding extra page to allocation of length {}", length);
return false;
}
length += PAGE_SIZE;
auto region_size_or_error = Memory::page_round_up(length);
if (region_size_or_error.is_error()) {
dbgln("Failed to round up length of {} to pages", length);
return false;
}
auto mcfg_region_or_error = MM.allocate_kernel_region(mcfg_table.page_base(), region_size_or_error.value(), "PCI Parsing MCFG", Memory::Region::Access::ReadWrite);
if (mcfg_region_or_error.is_error())
return false;
auto& mcfg = *(ACPI::Structures::MCFG*)mcfg_region_or_error.value()->vaddr().offset(mcfg_table.offset_in_page()).as_ptr();