usb: gadget: goku_udc: fix potential crashes in probe

[ Upstream commit 0d66e04875c5aae876cf3d4f4be7978fa2b00523 ]

goku_probe() goes to error label "err" and invokes goku_remove()
in case of failures of pci_enable_device(), pci_resource_start()
and ioremap(). goku_remove() gets a device from
pci_get_drvdata(pdev) and works with it without any checks, in
particular it dereferences a corresponding pointer. But
goku_probe() did not set this device yet. So, one can expect
various crashes. The patch moves setting the device just after
allocation of memory for it.

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

Reported-by: Pavel Andrianov <andrianov@ispras.ru>
Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/gadget/udc/goku_udc.c b/drivers/usb/gadget/udc/goku_udc.c
index 5107987bd35382b8054d789c44546fc196c40f3d..d363224dce6f51a85dc36712aeef2b8410624093 100644 (file)
--- a/drivers/usb/gadget/udc/goku_udc.c
+++ b/drivers/usb/gadget/udc/goku_udc.c
@@ -1772,6 +1772,7 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
                goto err;
        }
 
+       pci_set_drvdata(pdev, dev);
        spin_lock_init(&dev->lock);
        dev->pdev = pdev;
        dev->gadget.ops = &goku_ops;
@@ -1805,7 +1806,6 @@ static int goku_probe(struct pci_dev *pdev, const struct pci_device_id *id)
        }
        dev->regs = (struct goku_udc_regs __iomem *) base;
 
-       pci_set_drvdata(pdev, dev);
        INFO(dev, "%s\n", driver_desc);
        INFO(dev, "version: " DRIVER_VERSION " %s\n", dmastr());
        INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);