From patchwork Wed Nov 16 11:11:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Carpenter X-Patchwork-Id: 38140 Received: from mail.tu-berlin.de ([130.149.7.33]) by www.linuxtv.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c6y99-0002MS-Q8; Wed, 16 Nov 2016 11:12:55 +0000 X-tubIT-Incoming-IP: 209.132.180.67 Received: from vger.kernel.org ([209.132.180.67]) by mail.tu-berlin.de (exim-4.84_2/mailfrontend-7) with esmtp id 1c6y96-00011u-1a; Wed, 16 Nov 2016 12:12:54 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422662AbcKPLMt (ORCPT + 1 other); Wed, 16 Nov 2016 06:12:49 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:32551 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964938AbcKPLMs (ORCPT ); Wed, 16 Nov 2016 06:12:48 -0500 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id uAGBCeAc019463 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 16 Nov 2016 11:12:40 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0022.oracle.com (8.14.4/8.13.8) with ESMTP id uAGBCdxa011304 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 16 Nov 2016 11:12:39 GMT Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id uAGBCbeL009829; Wed, 16 Nov 2016 11:12:37 GMT Received: from mwanda (/154.122.158.141) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 16 Nov 2016 03:12:31 -0800 Date: Wed, 16 Nov 2016 14:11:54 +0300 From: Dan Carpenter To: Mauro Carvalho Chehab Cc: Wolfram Sang , Greg Kroah-Hartman , Hans Verkuil , linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [patch v2] [media] stk-webcam: fix an endian bug in stk_camera_read_reg() Message-ID: <20161116111154.GA27862@mwanda> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20161115094808.GA15424@mwanda> User-Agent: Mutt/1.6.0 (2016-04-01) X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-PMX-Version: 6.0.0.2142326, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2016.11.16.110617 X-PMX-Spam: Gauge=IIIIIIIII, Probability=9%, Report=' MULTIPLE_RCPTS 0.1, HTML_00_01 0.05, HTML_00_10 0.05, MSGID_ADDED_BY_MTA 0.05, BODY_SIZE_3000_3999 0, BODY_SIZE_5000_LESS 0, BODY_SIZE_7000_LESS 0, INVALID_MSGID_NO_FQDN 0, IN_REP_TO 0, LEGITIMATE_NEGATE 0, LEGITIMATE_SIGNS 0, MSG_THREAD 0, MULTIPLE_REAL_RCPTS 0, NO_URI_HTTPS 0, SINGLE_URI_IN_BODY 0, URI_ENDS_IN_HTML 0, __ANY_URI 0, __CC_NAME 0, __CC_NAME_DIFF_FROM_ACC 0, __CC_REAL_NAMES 0, __CD 0, __CP_URI_IN_BODY 0, __CT 0, __CT_TEXT_PLAIN 0, __DATE_TZ_RU 0, __HAS_CC_HDR 0, __HAS_FROM 0, __HAS_MSGID 0, __HAS_X_MAILING_LIST 0, __IN_REP_TO 0, __MIME_TEXT_ONLY 0, __MIME_TEXT_P 0, __MIME_TEXT_P1 0, __MIME_VERSION 0, __MULTIPLE_RCPTS_CC_X2 0, __NO_HTML_TAG_RAW 0, __SANE_MSGID 0, __SINGLE_URI_TEXT 0, __TO_MALFORMED_2 0, __TO_NAME 0, __TO_NAME_DIFF_FROM_ACC 0, __TO_REAL_NAMES 0, __URI_IN_BODY 0, __URI_NO_WWW 0, __URI_NS , __URI_WITH_PATH 0, __USER_AGENT 0' We pass an int pointer to stk_camera_read_reg() but only write to the highest byte. It's a bug on big endian systems and generally a nasty thing to do and doesn't match the write function either. Signed-off-by: Dan Carpenter --- v2: I forgot to update stk-sensor.c in version 1. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/media/usb/stkwebcam/stk-webcam.h b/drivers/media/usb/stkwebcam/stk-webcam.h index 9bbfa3d..92bb48e 100644 --- a/drivers/media/usb/stkwebcam/stk-webcam.h +++ b/drivers/media/usb/stkwebcam/stk-webcam.h @@ -129,7 +129,7 @@ struct stk_camera { #define vdev_to_camera(d) container_of(d, struct stk_camera, vdev) int stk_camera_write_reg(struct stk_camera *, u16, u8); -int stk_camera_read_reg(struct stk_camera *, u16, int *); +int stk_camera_read_reg(struct stk_camera *, u16, u8 *); int stk_sensor_init(struct stk_camera *); int stk_sensor_configure(struct stk_camera *); diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c index 22a9aae..1c48f2f 100644 --- a/drivers/media/usb/stkwebcam/stk-webcam.c +++ b/drivers/media/usb/stkwebcam/stk-webcam.c @@ -144,7 +144,7 @@ int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value) return 0; } -int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value) +int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value) { struct usb_device *udev = dev->udev; unsigned char *buf; @@ -163,7 +163,7 @@ int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value) sizeof(u8), 500); if (ret >= 0) - memcpy(value, buf, sizeof(u8)); + *value = *buf; kfree(buf); return ret; @@ -171,9 +171,10 @@ int stk_camera_read_reg(struct stk_camera *dev, u16 index, int *value) static int stk_start_stream(struct stk_camera *dev) { - int value; + u8 value; int i, ret; - int value_116, value_117; + u8 value_116, value_117; + if (!is_present(dev)) return -ENODEV; @@ -213,7 +214,7 @@ static int stk_start_stream(struct stk_camera *dev) static int stk_stop_stream(struct stk_camera *dev) { - int value; + u8 value; int i; if (is_present(dev)) { stk_camera_read_reg(dev, 0x0100, &value); diff --git a/drivers/media/usb/stkwebcam/stk-sensor.c b/drivers/media/usb/stkwebcam/stk-sensor.c index e546b01..2dcc8d0 100644 --- a/drivers/media/usb/stkwebcam/stk-sensor.c +++ b/drivers/media/usb/stkwebcam/stk-sensor.c @@ -228,7 +228,7 @@ static int stk_sensor_outb(struct stk_camera *dev, u8 reg, u8 val) { int i = 0; - int tmpval = 0; + u8 tmpval = 0; if (stk_camera_write_reg(dev, STK_IIC_TX_INDEX, reg)) return 1; @@ -253,7 +253,7 @@ static int stk_sensor_outb(struct stk_camera *dev, u8 reg, u8 val) static int stk_sensor_inb(struct stk_camera *dev, u8 reg, u8 *val) { int i = 0; - int tmpval = 0; + u8 tmpval = 0; if (stk_camera_write_reg(dev, STK_IIC_RX_INDEX, reg)) return 1; @@ -274,7 +274,7 @@ static int stk_sensor_inb(struct stk_camera *dev, u8 reg, u8 *val) if (stk_camera_read_reg(dev, STK_IIC_RX_VALUE, &tmpval)) return 1; - *val = (u8) tmpval; + *val = tmpval; return 0; }