Re: [PATCH] usb: typec: fix null-pointer-dereference in wcove_typec_probe()

[Greg KH]

On Fri, Aug 21, 2026 at 07:22:46PM +0530, Jeffin Philip wrote:
> dev_get_drvdata() on the parent device can return NULL if we attempt to
> bind our device as a root device with no parent. This causes a null pointer
> dereference when accessing pmic->regmap later as pmic uses the parent
> struct. Fix this by adding a NULL check for pmic and returning -ENODEV
> if to_platform_device() returns NULL for pmic.
> 
> Reported-by: syzbot+1a01783ea233350598b5@xxxxxxxxxxxxxxxxxxxxxxxxx
> Closes: https://syzkaller.appspot.com/bug?extid=1a01783ea233350598b5
> Fixes: d2061f9cc32d ("usb: typec: add driver for Intel Whiskey Cove PMIC USB Type-C PHY")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Jeffin Philip <jeffinphilip14@xxxxxxxxx>
> ---
>  drivers/usb/typec/tcpm/wcove.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/wcove.c b/drivers/usb/typec/tcpm/wcove.c
> index 0e5a3e277c3e..80bca8edeba6 100644
> --- a/drivers/usb/typec/tcpm/wcove.c
> +++ b/drivers/usb/typec/tcpm/wcove.c
> @@ -612,6 +612,10 @@ static int wcove_typec_probe(struct platform_device *pdev)
>  	int irq;
>  	int ret;
>  
> +	/* check if we have a parent device first */
> +	if (!pmic)
> +		return -ENODEV;

How can a platform device NOT have a parent device?  WHat system is this
broken in?  Why not fix the platform definition properly instead as
something is really wrong here if this is a "root" platform device as
that should never happen.

thanks,

greg k-h