On Tue, 20 Aug 2013, Krzysztof Mazur wrote:
> > The second patch can either clean up the port devices by hand, or else
> > jump to a new label after the line that sets maxchild to 0.
> > Alan Stern
>
> I think that new label is better, it's equivalent to previous version
> except for ugly rename of original fail label.
>
> Thanks,
> Krzysiek
> -- >8 --
> Subject: [PATCH 2/2 v2] usb: fail on usb_hub_create_port_device() errors
>
> Ignoring usb_hub_create_port_device() errors cause later NULL pointer
> deference when uninitialized hub->ports[i] entries are dereferenced
> after port memory allocation error.
>
> Signed-off-by: Krzysztof Mazur <krzysiek@xxxxxxxxxxxx>
> ---
> drivers/usb/core/hub.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index affed11..292ffa8 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -1557,10 +1557,15 @@ static int hub_configure(struct usb_hub *hub,
> if (hub->has_indicators && blinkenlights)
> hub->indicator [0] = INDICATOR_CYCLE;
>
> - for (i = 0; i < hdev->maxchild; i++)
> - if (usb_hub_create_port_device(hub, i + 1) < 0)
> + for (i = 0; i < hdev->maxchild; i++) {
> + ret = usb_hub_create_port_device(hub, i + 1);
> + if (ret < 0) {
> dev_err(hub->intfdev,
> "couldn't create port%d device.\n", i + 1);
> + hdev->maxchild = i;
> + goto fail_keep_maxchild;
> + }
> + }
>
> usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
>
> @@ -1569,6 +1574,7 @@ static int hub_configure(struct usb_hub *hub,
>
> fail:
> hdev->maxchild = 0;
> +fail_keep_maxchild:
> dev_err (hub_dev, "config failed, %s (err %d)\n",
> message, ret);
> /* hub_disconnect() frees urb and descriptor */
Much better.
Alan Stern
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