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pci: Check region ranges are addressable

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When parsing the `ranges` DT node, check that both extremes of the
regions are addressable without overflow. This assumption can then be
safely made when processing the regions.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Andrew Scull 2022-04-21 16:11:07 +00:00 committed by Tom Rini
parent 60f4142aa2
commit ec8eba8c2d
1 changed files with 16 additions and 1 deletions
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17
drivers/pci/pci-uclass.c
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@ -1013,7 +1013,22 @@ static void decode_regions(struct pci_controller *hose, ofnode parent_node,
if (!IS_ENABLED(CONFIG_SYS_PCI_64BIT) && if (!IS_ENABLED(CONFIG_SYS_PCI_64BIT) &&
type == PCI_REGION_MEM && upper_32_bits(pci_addr)) { type == PCI_REGION_MEM && upper_32_bits(pci_addr)) {
debug(" - beyond the 32-bit boundary, ignoring\n"); debug(" - pci_addr beyond the 32-bit boundary, ignoring\n");
continue;
}
if (!IS_ENABLED(CONFIG_PHYS_64BIT) && upper_32_bits(addr)) {
debug(" - addr beyond the 32-bit boundary, ignoring\n");
continue;
}
if (~((pci_addr_t)0) - pci_addr < size) {
debug(" - PCI range exceeds max address, ignoring\n");
continue;
}
if (~((phys_addr_t)0) - addr < size) {
debug(" - phys range exceeds max address, ignoring\n");
continue; continue;
} }