Re: [Qemu-devel] [PATCH] pcihp: fix possible array out of bounds

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

On Tue, 2014-08-19 at 15:18 +0800, arei.gonglei@huawei.com wrote:
> From: Gonglei <arei.gonglei@huawei.com>
> 
> When 'bsel == ACPI_PCIHP_MAX_HOTPLUG_BUS', the
> s->acpi_pcihp_pci_status[bsel] array will out of bounds.
I would change the commit message to something like
"Prevent out-of-bounds array access on acpi_pcihp_pci_status.

Other than that, it looks OK to me.
Thanks,
Marcel

> 
> Add check for this.
> 
> Signed-off-by: Gonglei <arei.gonglei@huawei.com>
> ---
>  hw/acpi/pcihp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
> index fae663a..34dedf1 100644
> --- a/hw/acpi/pcihp.c
> +++ b/hw/acpi/pcihp.c
> @@ -231,7 +231,7 @@ static uint64_t pci_read(void *opaque, hwaddr addr, unsigned int size)
>      uint32_t val = 0;
>      int bsel = s->hotplug_select;
>  
> -    if (bsel < 0 || bsel > ACPI_PCIHP_MAX_HOTPLUG_BUS) {
> +    if (bsel < 0 || bsel >= ACPI_PCIHP_MAX_HOTPLUG_BUS) {
>          return 0;
>      }
>