[U-Boot] [PATCH 1/2] pci: Add boundary check for hose->regions

[Thierry Reding <thierry.reding@gmail.com>]

From: Thierry Reding <treding@nvidia.com>

Make sure that we don't overflow the hose->regions array, otherwise we
would end up overwriting the hose->region_count field and cause mayhem
to ensue. Also print an error message when we'd be overflowing because
it indicates that there aren't enough regions available and the number
needs to be increased.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/pci/pci-uclass.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index 824fa1190747..cf1e7617ae35 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -918,6 +918,11 @@ static void decode_regions(struct pci_controller *hose, ofnode parent_node,
 		return;
 
 	for (i = 0; i < CONFIG_NR_DRAM_BANKS; ++i) {
+		if (hose->region_count == MAX_PCI_REGIONS) {
+			pr_err("maximum number of regions parsed, aborting\n");
+			break;
+		}
+
 		if (bd->bi_dram[i].size) {
 			pci_set_region(hose->regions + hose->region_count++,
 				       bd->bi_dram[i].start,
-- 
2.20.1