linux-kernel - [PATCH v1] usb: fsl: Check memory resource before releasing it

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Date:   Mon, 21 Oct 2019 18:21:51 +0800
From:   Yinbo Zhu <yinbo.zhu@....com>
To:     Li Yang <leoyang.li@....com>, Felipe Balbi <balbi@...nel.org>
Cc:     yinbo.zhu@....com, xiaobo.xie@....com, jiafei.pan@....com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Ran Wang <ran.wang_1@....com>,
        Nikhil Badola <nikhil.badola@...escale.com>
Subject: [PATCH v1] usb: fsl: Check memory resource before releasing it

From: Nikhil Badola <nikhil.badola@...escale.com>

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

Signed-off-by: Nikhil Badola <nikhil.badola@...escale.com>
Reviewed-by: Ran Wang <ran.wang_1@....com>
Reviewed-by: Peter Chen <peter.chen@....com>
---
 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 */
-- 
2.17.1