From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BA2B2C4743C for ; Mon, 21 Jun 2021 11:57:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A21DC61153 for ; Mon, 21 Jun 2021 11:57:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230252AbhFUL72 (ORCPT ); Mon, 21 Jun 2021 07:59:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:34260 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229789AbhFUL7H (ORCPT ); Mon, 21 Jun 2021 07:59:07 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2FBBC61245; Mon, 21 Jun 2021 11:56:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624276613; bh=11eW0KcqaEnwVcqSAzyPNAdsSG+zIv8WUhOkdsd8c6A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jmBWtdlwqBDKNAm0dTHfHk3uqCFK1ZsHbkjcsduKsXqVvOuPet+GLsoDYXPdjlrHI ck08bAldltzViQVZn+i1HyTKGKPchxS0WT6ipRn2IehNUswLZOyO91AbbVceEUlmkQ 12I+mXI7BXnIcZEfIpSCni2VR8SXYy6OnyECYPvDvpgcM16IXowGfQ1YvNoaTGttbM 5ttJwJzQyGLB+6U2ZBTy1aSWJ8GgtkamPMz6skmPi5S70ZwyO7UJAd2r0gomfwDWoE NdkTvEDKY2JqJfK5vXrUzDHlb2Bh1Jexz2V6/8nG839FdrFaxkHqcjWH3kfR83FSDD DXhKyvRindZfA== Received: by mail.kernel.org with local (Exim 4.94.2) (envelope-from ) id 1lvIXr-000Hcs-0m; Mon, 21 Jun 2021 13:56:51 +0200 From: Mauro Carvalho Chehab Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , Andy Walls , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 4/5] media: ivtv: prevent going past the hw arrays Date: Mon, 21 Jun 2021 13:56:48 +0200 Message-Id: <94334c02c246fad023ec04a02c43b708d853b0cc.1624276138.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: Mauro Carvalho Chehab To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As warned by smatch: drivers/media/pci/ivtv/ivtv-i2c.c:245 ivtv_i2c_register() error: buffer overflow 'hw_devicenames' 21 <= 31 drivers/media/pci/ivtv/ivtv-i2c.c:266 ivtv_i2c_register() error: buffer overflow 'hw_addrs' 21 <= 31 drivers/media/pci/ivtv/ivtv-i2c.c:269 ivtv_i2c_register() error: buffer overflow 'hw_addrs' 21 <= 31 drivers/media/pci/ivtv/ivtv-i2c.c:275 ivtv_i2c_register() error: buffer overflow 'hw_addrs' 21 <= 31 drivers/media/pci/ivtv/ivtv-i2c.c:280 ivtv_i2c_register() error: buffer overflow 'hw_addrs' 21 <= 31 drivers/media/pci/ivtv/ivtv-i2c.c:290 ivtv_i2c_register() error: buffer overflow 'hw_addrs' 21 <= 31 The logic at ivtv_i2c_register() could let buffer overflows at hw_devicenames and hw_addrs arrays. This won't happen in practice due to a carefully-contructed logic, but it is not error-prune. Change the logic in a way that will make clearer that the I2C hardware flags will affect the size of those two arrays, and add an explicit check to avoid buffer overflows. While here, use the bit macro. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/pci/ivtv/ivtv-cards.h | 68 ++++++++++++++++++++--------- drivers/media/pci/ivtv/ivtv-i2c.c | 16 ++++--- 2 files changed, 58 insertions(+), 26 deletions(-) diff --git a/drivers/media/pci/ivtv/ivtv-cards.h b/drivers/media/pci/ivtv/ivtv-cards.h index f3e2c5634962..494982e4165d 100644 --- a/drivers/media/pci/ivtv/ivtv-cards.h +++ b/drivers/media/pci/ivtv/ivtv-cards.h @@ -78,27 +78,53 @@ #define IVTV_PCI_ID_SONY 0x104d /* hardware flags, no gaps allowed */ -#define IVTV_HW_CX25840 (1 << 0) -#define IVTV_HW_SAA7115 (1 << 1) -#define IVTV_HW_SAA7127 (1 << 2) -#define IVTV_HW_MSP34XX (1 << 3) -#define IVTV_HW_TUNER (1 << 4) -#define IVTV_HW_WM8775 (1 << 5) -#define IVTV_HW_CS53L32A (1 << 6) -#define IVTV_HW_TVEEPROM (1 << 7) -#define IVTV_HW_SAA7114 (1 << 8) -#define IVTV_HW_UPD64031A (1 << 9) -#define IVTV_HW_UPD6408X (1 << 10) -#define IVTV_HW_SAA717X (1 << 11) -#define IVTV_HW_WM8739 (1 << 12) -#define IVTV_HW_VP27SMPX (1 << 13) -#define IVTV_HW_M52790 (1 << 14) -#define IVTV_HW_GPIO (1 << 15) -#define IVTV_HW_I2C_IR_RX_AVER (1 << 16) -#define IVTV_HW_I2C_IR_RX_HAUP_EXT (1 << 17) /* External before internal */ -#define IVTV_HW_I2C_IR_RX_HAUP_INT (1 << 18) -#define IVTV_HW_Z8F0811_IR_HAUP (1 << 19) -#define IVTV_HW_I2C_IR_RX_ADAPTEC (1 << 20) +enum ivtv_hw_bits { + IVTV_HW_BIT_CX25840 = 0, + IVTV_HW_BIT_SAA7115 = 1, + IVTV_HW_BIT_SAA7127 = 2, + IVTV_HW_BIT_MSP34XX = 3, + IVTV_HW_BIT_TUNER = 4, + IVTV_HW_BIT_WM8775 = 5, + IVTV_HW_BIT_CS53L32A = 6, + IVTV_HW_BIT_TVEEPROM = 7, + IVTV_HW_BIT_SAA7114 = 8, + IVTV_HW_BIT_UPD64031A = 9, + IVTV_HW_BIT_UPD6408X = 10, + IVTV_HW_BIT_SAA717X = 11, + IVTV_HW_BIT_WM8739 = 12, + IVTV_HW_BIT_VP27SMPX = 13, + IVTV_HW_BIT_M52790 = 14, + IVTV_HW_BIT_GPIO = 15, + IVTV_HW_BIT_I2C_IR_RX_AVER = 16, + IVTV_HW_BIT_I2C_IR_RX_HAUP_EXT = 17, /* External before internal */ + IVTV_HW_BIT_I2C_IR_RX_HAUP_INT = 18, + IVTV_HW_BIT_Z8F0811_IR_HAUP = 19, + IVTV_HW_BIT_I2C_IR_RX_ADAPTEC = 20, + + IVTV_HW_MAX_BITS = 21 /* Should be the last bit + 1 */ +}; + +#define IVTV_HW_CX25840 BIT(IVTV_HW_BIT_CX25840) +#define IVTV_HW_SAA7115 BIT(IVTV_HW_BIT_SAA7115) +#define IVTV_HW_SAA7127 BIT(IVTV_HW_BIT_SAA7127) +#define IVTV_HW_MSP34XX BIT(IVTV_HW_BIT_MSP34XX) +#define IVTV_HW_TUNER BIT(IVTV_HW_BIT_TUNER) +#define IVTV_HW_WM8775 BIT(IVTV_HW_BIT_WM8775) +#define IVTV_HW_CS53L32A BIT(IVTV_HW_BIT_CS53L32A) +#define IVTV_HW_TVEEPROM BIT(IVTV_HW_BIT_TVEEPROM) +#define IVTV_HW_SAA7114 BIT(IVTV_HW_BIT_SAA7114) +#define IVTV_HW_UPD64031A BIT(IVTV_HW_BIT_UPD64031A) +#define IVTV_HW_UPD6408X BIT(IVTV_HW_BIT_UPD6408X) +#define IVTV_HW_SAA717X BIT(IVTV_HW_BIT_SAA717X) +#define IVTV_HW_WM8739 BIT(IVTV_HW_BIT_WM8739) +#define IVTV_HW_VP27SMPX BIT(IVTV_HW_BIT_VP27SMPX) +#define IVTV_HW_M52790 BIT(IVTV_HW_BIT_M52790) +#define IVTV_HW_GPIO BIT(IVTV_HW_BIT_GPIO) +#define IVTV_HW_I2C_IR_RX_AVER BIT(IVTV_HW_BIT_I2C_IR_RX_AVER) +#define IVTV_HW_I2C_IR_RX_HAUP_EXT BIT(IVTV_HW_BIT_I2C_IR_RX_HAUP_EXT) +#define IVTV_HW_I2C_IR_RX_HAUP_INT BIT(IVTV_HW_BIT_I2C_IR_RX_HAUP_INT) +#define IVTV_HW_Z8F0811_IR_HAUP BIT(IVTV_HW_BIT_Z8F0811_IR_HAUP) +#define IVTV_HW_I2C_IR_RX_ADAPTEC BIT(IVTV_HW_BIT_I2C_IR_RX_ADAPTEC) #define IVTV_HW_SAA711X (IVTV_HW_SAA7115 | IVTV_HW_SAA7114) diff --git a/drivers/media/pci/ivtv/ivtv-i2c.c b/drivers/media/pci/ivtv/ivtv-i2c.c index 982045c4eea8..c052c57c6dce 100644 --- a/drivers/media/pci/ivtv/ivtv-i2c.c +++ b/drivers/media/pci/ivtv/ivtv-i2c.c @@ -85,7 +85,7 @@ #define IVTV_ADAPTEC_IR_ADDR 0x6b /* This array should match the IVTV_HW_ defines */ -static const u8 hw_addrs[] = { +static const u8 hw_addrs[IVTV_HW_MAX_BITS] = { IVTV_CX25840_I2C_ADDR, IVTV_SAA7115_I2C_ADDR, IVTV_SAA7127_I2C_ADDR, @@ -110,7 +110,7 @@ static const u8 hw_addrs[] = { }; /* This array should match the IVTV_HW_ defines */ -static const char * const hw_devicenames[] = { +static const char * const hw_devicenames[IVTV_HW_MAX_BITS] = { "cx25840", "saa7115", "saa7127_auto", /* saa7127 or saa7129 */ @@ -240,10 +240,16 @@ void ivtv_i2c_new_ir_legacy(struct ivtv *itv) int ivtv_i2c_register(struct ivtv *itv, unsigned idx) { - struct v4l2_subdev *sd; struct i2c_adapter *adap = &itv->i2c_adap; - const char *type = hw_devicenames[idx]; - u32 hw = 1 << idx; + struct v4l2_subdev *sd; + const char *type; + u32 hw; + + if (idx >= IVTV_HW_MAX_BITS) + return -ENODEV; + + type = hw_devicenames[idx]; + hw = 1 << idx; if (hw == IVTV_HW_TUNER) { /* special tuner handling */ -- 2.31.1