usb: musb: tusb6010: check return value after calling platform_get_resource()

[ 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@huawei.com>
Link: https://lore.kernel.org/r/20210915034925.2399823-1-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/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 4ecfbf6bb1fa80574e03d8b6b388d1a43bb9c114..902507da8aa85e4918710a1d274c967850bc414d 100644 (file)
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -1103,6 +1103,11 @@ 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 */