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

[Bin Meng]

On Wed, Nov 18, 2015 at 10:05 PM, Marcel Ziswiler
<marcel.ziswiler at toradex.com> wrote:
> 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;
>                 }
> --

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>