From: Yang Yingliang <yangyingliang@huawei.com>
Date: Tue, 31 Aug 2021 08:42:36 +0000 (+0800)
Subject: usb: dwc2: check return value after calling platform_get_resource()
X-Git-Tag: v4.19.210~6
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a7182993dd8e09f96839ddc3ac54f9b37370d282;p=users%2Fdwmw2%2Flinux.git

usb: dwc2: check return value after calling platform_get_resource()

[ Upstream commit 856e6e8e0f9300befa87dde09edb578555c99a82 ]

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

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210831084236.1359677-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 58e53e3d905be..22c4d554865ee 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -5234,6 +5234,10 @@ 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);