[PATCH 4.14 204/251] usb: musb: tusb6010: check return value after calling platform_get_resource()

[Greg Kroah-Hartman]

From: Yang Yingliang <yangyingliang@xxxxxxxxxx>

[ Upstream commit 14651496a3de6807a17c310f63c894ea0c5d858e ]

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

Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210915034925.2399823-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/usb/musb/tusb6010.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 7d7cb1c5ec808..9a7b5b2d7ccc7 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -1108,6 +1108,11 @@ static int tusb_musb_init(struct musb *musb)
 
 	/* dma address for async dma */
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		pr_debug("no async dma resource?\n");
+		ret = -ENODEV;
+		goto done;
+	}
 	musb->async = mem->start;
 
 	/* dma address for sync dma */
-- 
2.33.0