USB: dummy-hcd: Fix uninitialized array use in init()

stable inclusion
from stable-5.10.2
commit 5fb2a55ad3e0a7f3c5094c36a54c230355ed3d38
bugzilla: 46859

--------------------------------

commit e90cfa81 upstream.

This error path

	err_add_pdata:
		for (i = 0; i < mod_data.num; i++)
			kfree(dum[i]);

can be triggered when not all dum's elements are initialized.

Fix this by initializing all dum's elements to NULL.
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NBui Quang Minh <minhquangbui99@gmail.com>
Link: https://lore.kernel.org/r/1607063090-3426-1-git-send-email-minhquangbui99@gmail.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>

drivers/usb/gadget/udc/dummy_hcd.c

@@ -2734,7 +2734,7 @@ static int __init init(void)
 {
 	int	retval = -ENOMEM;
 	int	i;
-	struct	dummy *dum[MAX_NUM_UDC];
+	struct	dummy *dum[MAX_NUM_UDC] = {};
 
 	if (usb_disabled())
 		return -ENODEV;