# \[PATCH -next\] usb: dwc2: check return value after calling platform\_get\_resource()

- From: Yang Yingliang \<hidden\>
- Date: 2021-08-31 08:37:12 
- List: linux-usb
- Page: https://ratatoskr.run/linux-usb/2021/08/1493058
- Thread: https://ratatoskr.run/linux-usb/2021/08/1493058/t.md

```text
It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <redacted>
---
 drivers/usb/dwc2/hcd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 2a7828971d05..a215ec9e172e 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -5191,6 +5191,10 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg)
 	hcd->has_tt = 1;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		retval = -EINVAL;
+		goto error1;
+	}
 	hcd->rsrc_start = res->start;
 	hcd->rsrc_len = resource_size(res);
 
-- 
2.25.1

```