[PATCH] usb: gadget: net2280: Fix double free in probe error path

[Guangshuo Li]

usb_initialize_gadget() installs gadget_release() as the release
callback for the embedded gadget device.  The struct net2280 instance is
therefore released through gadget_release() when the gadget device's last
reference is dropped.

The probe error path calls net2280_remove(), which tears down the
partially initialized device and drops the gadget reference with
usb_put_gadget().  Calling kfree(dev) afterwards can free the same object
again.

Drop the explicit kfree() and let the gadget device release callback
handle the final free. This issue was found by a static analysis tool
I am developing.

Fixes: 2468c877da42 ("usb: gadget: net2280: fix memory leak on probe error handling paths")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/usb/gadget/udc/net2280.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index d02765bd49ce..90d678e6714f 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -3792,7 +3792,6 @@ static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 done:
 	if (dev) {
 		net2280_remove(pdev);
-		kfree(dev);
 	}
 	return retval;
 }
-- 
2.43.0