From d878c9a932eae626aced58128357fc6155f88739 Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Mon, 11 Aug 2014 16:09:28 -0600 Subject: [PATCH] pci: fix overflow in __pci_hose_bus_to_phys w/ large RAM If a 32-bit system has 2GB of RAM, and the base address of that RAM is 2GB, then start+size will overflow a 32-bit value (to a value of 0). To avoid such an overflow, convert __pci_hose_bus_to_phys() to calculate the offset of a bus address into a PCI region, rather than comparing a bus address against the end of a PCI region. Signed-off-by: Stephen Warren --- drivers/pci/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index ed113bf..4fd9c53 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -323,7 +323,7 @@ int __pci_hose_bus_to_phys(struct pci_controller *hose, continue; if (bus_addr >= res->bus_start && - bus_addr < res->bus_start + res->size) { + (bus_addr - res->bus_start) < res->size) { *pa = (bus_addr - res->bus_start + res->phys_start); return 0; } -- 2.7.4