thor: fix crash after usb initialization failure

Registration of USB download gadget might fail for various reasons, so
add a check for g_dnl_register() funtion return value. Without this fix,
thor_init() will try to access the registered gadget structures resulting
in NULL pointer dereference issue.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>

diff --git a/cmd/thordown.c b/cmd/thordown.c
index 19ae6721d19a60460a184d70ca5d0a8a382cca03..dd0544d475723d14ce6bd298963ca62e411d42ed 100644 (file)
--- a/cmd/thordown.c
+++ b/cmd/thordown.c
@@ -37,7 +37,11 @@ int do_thor_down(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
                goto exit;
        }
 
-       g_dnl_register("usb_dnl_thor");
+       ret = g_dnl_register("usb_dnl_thor");
+       if (ret) {
+               pr_err("g_dnl_register failed %d\n", ret);
+               return ret;
+       }
 
        ret = thor_init();
        if (ret) {