Re: usbcore: NULL pointer dereference after detaching USB disk with linux 4.17

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On May 11, 2018 6:14 PM, Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> wrote:
> 
> I think that just adding the below code should be enough for 4.17
> 
> diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
> 
> index 72ebbc9..32cd52c 100644
> 
> --- a/drivers/usb/host/xhci-hub.c
> 
> +++ b/drivers/usb/host/xhci-hub.c
> 
> @@ -354,7 +354,7 @@ int xhci_find_slot_id_by_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
> 
> slot_id = 0;
> 
> for (i = 0; i < MAX_HC_SLOTS; i++) {
> 
> -                 if (!xhci->devs[i])
>         
>     
> 
> -                 if (!xhci->devs[i] || !xhci->devs[i]->udev)
>         
>                            continue;
>                    speed = xhci->devs[i]->udev->speed;
>         
>                    if (((speed >= USB_SPEED_SUPER) == (hcd->speed >= HCD_USB3))
>         
>     
> 
> -Mathias

I can confirm that above patch fixes this. I saw that offending commit was
backported to 4.16.8 so it needs this fix as well. Thank you.
​
Jordan
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