usb: fsl: Check memory resource before releasing it

Check memory resource existence before releasing it to avoid NULL
pointer dereference

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Reviewed-by: Ran Wang <ran.wang_1@nxp.com>
Reviewed-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c
index 20141c3096f68ab4a2f51762dc0617715e473633..9a05863b28768a3e8fea85b376935baf961d36e9 100644 (file)
--- a/drivers/usb/gadget/udc/fsl_udc_core.c
+++ b/drivers/usb/gadget/udc/fsl_udc_core.c
@@ -2576,7 +2576,7 @@ static int fsl_udc_remove(struct platform_device *pdev)
        dma_pool_destroy(udc_controller->td_pool);
        free_irq(udc_controller->irq, udc_controller);
        iounmap(dr_regs);
-       if (pdata->operating_mode == FSL_USB2_DR_DEVICE)
+       if (res && (pdata->operating_mode == FSL_USB2_DR_DEVICE))
                release_mem_region(res->start, resource_size(res));
 
        /* free udc --wait for the release() finished */