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Subject[PATCH] usbip: fix error handling in stub_probe()
Date
If usb_hub_claim_port() fails, no resources are deallocated and
if stub_add_files() fails, port is not released.

The patch fixes these issues and rearranges error handling code.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
---
drivers/usb/usbip/stub_dev.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index fac20e0434c0..a3ec49bdc1e6 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -311,7 +311,6 @@ static int stub_probe(struct usb_device *udev)
{
struct stub_device *sdev = NULL;
const char *udev_busid = dev_name(&udev->dev);
- int err = 0;
struct bus_id_priv *busid_priv;
int rc;

@@ -372,23 +371,28 @@ static int stub_probe(struct usb_device *udev)
(struct usb_dev_state *) udev);
if (rc) {
dev_dbg(&udev->dev, "unable to claim port\n");
- return rc;
+ goto err_port;
}

- err = stub_add_files(&udev->dev);
- if (err) {
+ rc = stub_add_files(&udev->dev);
+ if (rc) {
dev_err(&udev->dev, "stub_add_files for %s\n", udev_busid);
- dev_set_drvdata(&udev->dev, NULL);
- usb_put_dev(udev);
- kthread_stop_put(sdev->ud.eh);
-
- busid_priv->sdev = NULL;
- stub_device_free(sdev);
- return err;
+ goto err_files;
}
busid_priv->status = STUB_BUSID_ALLOC;

return 0;
+err_files:
+ usb_hub_release_port(udev->parent, udev->portnum,
+ (struct usb_dev_state *) udev);
+err_port:
+ dev_set_drvdata(&udev->dev, NULL);
+ usb_put_dev(udev);
+ kthread_stop_put(sdev->ud.eh);
+
+ busid_priv->sdev = NULL;
+ stub_device_free(sdev);
+ return rc;
}

static void shutdown_busid(struct bus_id_priv *busid_priv)
--
1.9.1


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