diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 87657e0ca5fc..476a22728e8d 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -824,6 +824,8 @@ static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
 	struct gadget_info *gi = os_desc_item_to_gadget_info(item);
 	int res, l;
 
+	if (!len)
+		return len;
 	l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
 	if (page[l - 1] == '\n')
 		--l;