On Mon, 1 May 2017, Gustavo A. R. Silva wrote:
> Add null check before dereferencing dev->regs pointer inside
> net2280_led_shutdown() function.
>
> Addresses-Coverity-ID: 101783
> Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
> ---
> drivers/usb/gadget/udc/net2280.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
> index 3828c2e..1898a4b 100644
> --- a/drivers/usb/gadget/udc/net2280.c
> +++ b/drivers/usb/gadget/udc/net2280.c
> @@ -3573,7 +3573,11 @@ static void net2280_remove(struct pci_dev *pdev)
> BUG_ON(dev->driver);
>
> /* then clean up the resources we allocated during probe() */
> - net2280_led_shutdown(dev);
> +
> + if (dev->regs) {
> + net2280_led_shutdown(dev);
> + iounmap(dev->regs);
> + }
> if (dev->requests) {
> int i;
> for (i = 1; i < 5; i++) {
> @@ -3588,8 +3592,6 @@ static void net2280_remove(struct pci_dev *pdev)
> free_irq(pdev->irq, dev);
> if (dev->quirks & PLX_PCIE)
> pci_disable_msi(pdev);
> - if (dev->regs)
> - iounmap(dev->regs);
> if (dev->region)
> release_mem_region(pci_resource_start(pdev, 0),
> pci_resource_len(pdev, 0));
No, you must not move the iounmap() call, because an interrupt could
theoretically occur at any time.
Either just live with an extra test of dev->regs, or else move the
net2280_led_shutdown() call later.
Alan Stern
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