Re: [PATCH v2] drm/i915: Guard against NULL driver_data in i915_pci_probe()

[Deepanshu Kartikey]

On Thu, Aug 13, 2026 at 12:19 PM Deepanshu Kartikey
<kartikey406@xxxxxxxxx> wrote:
>
> pci_match_device() can return the dummy pci_device_id_any entry
> when a device is force-bound via sysfs driver_override, in which
> case ->driver_data is unset (NULL). i915_pci_probe() casts it to
> struct intel_device_info * unconditionally and dereferences
> intel_info->require_force_probe, causing a NULL-ptr-deref.
>
> Reported-by: syzbot+db96c5ff032f4292a8dc@xxxxxxxxxxxxxxxxxxxxxxxxx
> Closes: https://syzkaller.appspot.com/bug?extid=db96c5ff032f4292a8dc
> Tested-by: syzbot+db96c5ff032f4292a8dc@xxxxxxxxxxxxxxxxxxxxxxxxx
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Deepanshu Kartikey <kartikey406@xxxxxxxxx>
> ---
> v2: Drop Fixes tag, this isn't a regression from a single commit -
>     the unconditional dereference of ->driver_data has always assumed
>     it points into a MODULE_DEVICE_TABLE()-backed entry, an assumption
>     broken by the generic driver_override fallback path, not by any
>     i915-specific change. Add Cc: stable instead. (Krzysztof, Jani)
> ---
>  drivers/gpu/drm/i915/i915_pci.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index 82415af47d54..2f03f95945f1 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -958,6 +958,9 @@ static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>                 (struct intel_device_info *) ent->driver_data;
>         int err;
>
> +       if (!intel_info)
> +               return -ENODEV;
> +
>         if (intel_info->require_force_probe && !id_forced(pdev->device)) {
>                 dev_info(&pdev->dev,
>                          "Your graphics device %04x is not properly supported by i915 in this\n"
> --
> 2.43.0
>

Gente Reminder. Let me know the status of this patch .

Thanks

Deepanshu