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USB: fsl_qe_udc: Fix oops on QE UDC probe failure

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In case of probing errors the driver kfrees the udc_controller, but it
doesn't set the pointer to NULL.

When usb_gadget_register_driver is called, it checks for udc_controller
!= NULL, the check passes and the driver accesses nonexistent memory.
Fix this by setting udc_controller to NULL in case of errors.

While at it, also implement irq_of_parse_and_map()'s failure and cleanup
cases.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anton Vorontsov 2008-12-25 17:15:02 +03:00 committed by Greg Kroah-Hartman
parent f06da264cf
commit 94f341db3d
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/gadget/fsl_qe_udc.c
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@ -2604,6 +2604,10 @@ static int __devinit qe_udc_probe(struct of_device *ofdev,
(unsigned long)udc_controller);
/* request irq and disable DR */
udc_controller->usb_irq = irq_of_parse_and_map(np, 0);
if (!udc_controller->usb_irq) {
ret = -EINVAL;
goto err_noirq;
}
ret = request_irq(udc_controller->usb_irq, qe_udc_irq, 0,
driver_name, udc_controller);
@ -2625,6 +2629,8 @@ static int __devinit qe_udc_probe(struct of_device *ofdev,
err6:
free_irq(udc_controller->usb_irq, udc_controller);
err5:
irq_dispose_mapping(udc_controller->usb_irq);
err_noirq:
if (udc_controller->nullmap) {
dma_unmap_single(udc_controller->gadget.dev.parent,
udc_controller->nullp, 256,
@ -2648,7 +2654,7 @@ err2:
iounmap(udc_controller->usb_regs);
err1:
kfree(udc_controller);
udc_controller = NULL;
return ret;
}
@ -2710,6 +2716,7 @@ static int __devexit qe_udc_remove(struct of_device *ofdev)
kfree(ep->txframe);
free_irq(udc_controller->usb_irq, udc_controller);
irq_dispose_mapping(udc_controller->usb_irq);
tasklet_kill(&udc_controller->rx_tasklet);