[PATCH 5.14 18/48] usb: dwc2: check return value after calling platform_get_resource()

Greg Kroah-Hartman
2021-10-08T11:37:35Z

From: Yang Yingliang <yangyingliang@huawei.com>

[ 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>
---
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);

--
2.33.0