From: Nikhil Badola <nikhil.badola@freescale.com>
Date: Mon, 21 Oct 2019 18:21:51 +0800
Subject: usb: fsl: Check memory resource before releasing it
Git-commit: bc1e3a2dd0c9954fd956ac43ca2876bbea018c01
Patch-mainline: 5.4-rc6
References: bnc#1151927 5.3.11

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/usb/gadget/udc/fsl_udc_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 platfor
 	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 */