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 <[email protected]> Reviewed-by: Ran Wang <[email protected]> Reviewed-by: Peter Chen <[email protected]> Signed-off-by: Felipe Balbi <[email protected]>
ashr · Oct 27, 2019 · bc1e3a2 · bc1e3a2
1 parent a51bab5
commit bc1e3a2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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 */