[U-Boot] [PATCH] pci: fix address range check in __pci_hose_phys_to_bus()

[Marcel Ziswiler]

The address range check may overflow if the memory region is located at
the top of the 32-bit address space. This can e.g. be seen on TK1 if
using the E1000 gigabit Ethernet driver where start and size are both
0x80000000 leading to the following messages:

Apalis TK1 # tftpboot $loadaddr test_file
Using e1000#0 device
TFTP from server 192.168.10.1; our IP address is 192.168.10.2
Filename 'test_file'.
Load address: 0x80408000
Loading: pci_hose_phys_to_bus: invalid physical address

This patch fixes this by changing the order of the addition vs.
subtraction in the range check just like already done in
__pci_hose_bus_to_phys().

Reported-by: Ivan Mercier <ivan.mercier at nexvision.fr>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler at toradex.com>
---

 drivers/pci/pci_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pci_common.c b/drivers/pci/pci_common.c
index a64792f..2a14902 100644
--- a/drivers/pci/pci_common.c
+++ b/drivers/pci/pci_common.c
@@ -268,7 +268,7 @@ int __pci_hose_phys_to_bus(struct pci_controller *hose,
 		bus_addr = phys_addr - res->phys_start + res->bus_start;
 
 		if (bus_addr >= res->bus_start &&
-		    bus_addr < res->bus_start + res->size) {
+		    (bus_addr - res->bus_start) < res->size) {
 			*ba = bus_addr;
 			return 0;
 		}
-- 
2.5.0