From patchwork Fri Jun 12 05:32:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Macpaul Lin X-Patchwork-Id: 11601263 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A80996A2 for ; Fri, 12 Jun 2020 05:33:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8ED68207F7 for ; Fri, 12 Jun 2020 05:33:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="kNYQIaTx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726405AbgFLFdA (ORCPT ); Fri, 12 Jun 2020 01:33:00 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:60208 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725763AbgFLFc7 (ORCPT ); Fri, 12 Jun 2020 01:32:59 -0400 X-UUID: 239d2498b3b74fe9acfc7227611e421b-20200612 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=bDIpgkDQG7YLT+F0rsdng9S3ADGmLirI0hK3z/BZOuY=; b=kNYQIaTxVSeR2OoLWSPVuYo5ny3mIuwEwPFcqRNW1L6Cme2nqtm44PF8niJRfA/vZJsHqos5PzR8Bde6+6hjDU1rMQFJj784KxD92LC2v7llcZQMTw4jhQvxxkbmVwp+ilox0FbKzAfNrTr3DEyRAevgvYytmAykm7XDnnJdUPQ=; X-UUID: 239d2498b3b74fe9acfc7227611e421b-20200612 Received: from mtkcas07.mediatek.inc [(172.21.101.84)] by mailgw02.mediatek.com (envelope-from ) (Cellopoint E-mail Firewall v4.1.10 Build 0809 with TLS) with ESMTP id 1990203046; Fri, 12 Jun 2020 13:32:54 +0800 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs01n1.mediatek.inc (172.21.101.68) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 12 Jun 2020 13:32:51 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 12 Jun 2020 13:32:46 +0800 From: Macpaul Lin To: Felipe Balbi , Greg Kroah-Hartman , Matthias Brugger , , , , , Jim Lin , Siqi Lin CC: Mediatek WSD Upstream , Macpaul Lin , Macpaul Lin Subject: [PATCH] usb: replace hardcoded maximum usb string length by definition Date: Fri, 12 Jun 2020 13:32:47 +0800 Message-ID: <1591939967-29943-1-git-send-email-macpaul.lin@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-MTK: N Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Replace hardcoded maximum usb string length (126 bytes) by definition "MAX_USB_STRING_LEN". Signed-off-by: Macpaul Lin --- drivers/usb/gadget/composite.c | 4 ++-- drivers/usb/gadget/configfs.c | 3 ++- drivers/usb/gadget/usbstring.c | 5 +++-- include/linux/usb.h | 2 ++ 4 files changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index cb4950c..d0de016 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1041,7 +1041,7 @@ static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) while (*sp) { s = *sp; language = cpu_to_le16(s->language); - for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { + for (tmp = buf; *tmp && tmp < &buf[MAX_USB_STRING_LEN]; tmp++) { if (*tmp == language) goto repeat; } @@ -1116,7 +1116,7 @@ static int get_string(struct usb_composite_dev *cdev, collect_langs(sp, s->wData); } - for (len = 0; len <= 126 && s->wData[len]; len++) + for (len = 0; len <= MAX_USB_STRING_LEN && s->wData[len]; len++) continue; if (!len) return -EINVAL; diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c index 32b637e..c9d61ac 100644 --- a/drivers/usb/gadget/configfs.c +++ b/drivers/usb/gadget/configfs.c @@ -4,6 +4,7 @@ #include #include #include +#include #include #include #include "configfs.h" @@ -115,7 +116,7 @@ static int usb_string_copy(const char *s, char **s_copy) char *str; char *copy = *s_copy; ret = strlen(s); - if (ret > 126) + if (ret > MAX_USB_STRING_LEN) return -EOVERFLOW; str = kstrdup(s, GFP_KERNEL); diff --git a/drivers/usb/gadget/usbstring.c b/drivers/usb/gadget/usbstring.c index 7c24d1c..c125d59 100644 --- a/drivers/usb/gadget/usbstring.c +++ b/drivers/usb/gadget/usbstring.c @@ -11,6 +11,7 @@ #include #include +#include #include #include @@ -55,9 +56,9 @@ return -EINVAL; /* string descriptors have length, tag, then UTF16-LE text */ - len = min ((size_t) 126, strlen (s->s)); + len = min((size_t)MAX_USB_STRING_LEN, strlen(s->s)); len = utf8s_to_utf16s(s->s, len, UTF16_LITTLE_ENDIAN, - (wchar_t *) &buf[2], 126); + (wchar_t *) &buf[2], MAX_USB_STRING_LEN); if (len < 0) return -EINVAL; buf [0] = (len + 1) * 2; diff --git a/include/linux/usb.h b/include/linux/usb.h index 9f3c721..df4a9cb 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -1815,6 +1815,8 @@ static inline int usb_get_ptm_status(struct usb_device *dev, void *data) 0, data); } +/* USB String descriptors can contain at most 126 characters. */ +#define MAX_USB_STRING_LEN 126 extern int usb_string(struct usb_device *dev, int index, char *buf, size_t size);