Mailing List Archive: Re: [PATCH] i386/x86-64: Return defined error value for bad PCI config space accesses

Linux Kernel Mailing List wrote:
> - if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
> + if (!value || (bus > 255) || (devfn > 255) || (reg > 255)) {
> + *value = -1;
> return -EINVAL;
> + }
>
> spin_lock_irqsave(&pci_config_lock, flags);
>
> diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
> index 2002c74..f77d7f8 100644
> --- a/arch/i386/pci/mmconfig.c
> +++ b/arch/i386/pci/mmconfig.c
> @@ -80,8 +80,10 @@ static int pci_mmcfg_read(unsigned int s
> unsigned long flags;
> u32 base;
>
> - if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
> + if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) {
> + *value = -1;
> return -EINVAL;
> + }
>
> base = get_base_addr(seg, bus, devfn);
> if (!base)
> diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
> index d4e25f3..b493ed9 100644
> --- a/arch/x86_64/pci/mmconfig.c
> +++ b/arch/x86_64/pci/mmconfig.c
> @@ -75,8 +75,10 @@ static int pci_mmcfg_read(unsigned int s
> char __iomem *addr;
>
> /* Why do we have this when nobody checks it. How about a BUG()!? -AK */
> - if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095)))
> + if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095))) {
> + *value = -1;

As the code check indicates, value might be NULL.

Please fix.

Jeff

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