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

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>

diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index c4293769220793bc8ddab886bb8d82bdd0c854fe..e0347780907f1a6ec81e3597451dd7a802d2f61b 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 */