From bc1e3a2dd0c9954fd956ac43ca2876bbea018c01 Mon Sep 17 00:00:00 2001
From: Nikhil Badola <nikhil.badola@freescale.com>
Date: Mon, 21 Oct 2019 18:21:51 +0800
Subject: [PATCH] usb: fsl: Check memory resource before releasing it
Git-commit: bc1e3a2dd0c9954fd956ac43ca2876bbea018c01
Patch-mainline: v5.4-rc6
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/usb/gadget/udc/fsl_udc_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/udc/fsl_udc_core.c b/drivers/usb/gadget/udc/fsl_udc_core.c
index 20141c3096f6..9a05863b2876 100644
--- 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 */
--
2.26.2