Re: [PATCH 0/4] PCI: Fix procfs PCI config access issues

[Bjorn Helgaas <helgaas@kernel.org>]

On Tue, Apr 14, 2026 at 10:45:40AM +0800, Ziming Du wrote:
> Hi,
> 
> As suggested by Bjorn, this series aligns the implementation of procfs with
> the sysfs counterpart and fixes procfs PCI configuration access issues.
> 
> The first two patches refactor proc_bus_pci_{write,read}() to align
> with pci_write_config() and pci_read_config() respectively:
>   - Rename variables (pos->off, cnt->count/size) for consistency
>   - Remove rebundant bounds check
> 
> The last two patches fix potential overflow issues:
>   - Prevent overflow when offset exceeds reasonable range
>   - Fix implicit 64-bit to 32-bit truncation in read path
> 
> Link: https://lore.kernel.org/all/20260303193253.GA3817951@bhelgaas/
> 
> Ziming Du (4):
>   PCI: Align proc_bus_pci_write() with pci_write_config()
>   PCI: Align proc_bus_pci_read() with pci_read_config()
>   PCI: Prevent overflow in proc_bus_pci_write()
>   PCI: Prevent overflow in proc_bus_pci_read()
> 
>  drivers/pci/proc.c | 115 ++++++++++++++++++++++-----------------------
>  1 file changed, 57 insertions(+), 58 deletions(-)

Can you take a look at this:
https://sashiko.dev/#/patchset/20260414024544.2975605-1-duziming2%40huawei.com
and see whether there's anything we should do?

From a quick look, there might be a temporary regression and possibly
a pre-existing proc_bus_pci_write() issue.