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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 18973C3A5A2 for ; Sun, 22 Sep 2019 19:18:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CEF7820869 for ; Sun, 22 Sep 2019 19:18:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569179904; bh=y3oK5sd44kw9hUTqZ2mEExDtnP5Ij6BKs401hcRk3Uc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EMjAseIltYjcs4bjcAXNt32GIEomp0ywr09y1JHD2UXBnmijZ/640k4V/oD1Fek6m yzE1Gaiw1+F1WwGaGp9CQLSkPYiDtmnsHLvZgmpt1uglAqRt7+1VqmIb7xP+o9g6EY NyLBFGVlyxOwK9nGjwX4MqEQhUxy5gFSihHO827g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437722AbfIVSzS (ORCPT ); Sun, 22 Sep 2019 14:55:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:56344 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437375AbfIVSzR (ORCPT ); Sun, 22 Sep 2019 14:55:17 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 188FE21479; Sun, 22 Sep 2019 18:55:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569178516; bh=y3oK5sd44kw9hUTqZ2mEExDtnP5Ij6BKs401hcRk3Uc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dZzMzvSL/F6UwhBEjndWYXVP+Ea/ginc49RcfAmbD5Cg4JAEseIM1rRhaEHCaax7e fvKj35T0tqCSs3F7nM9ssUFR8QI6ZMmNwBrDID+Uw+yc+2qSdnXz4OJF7uGNbdG2Np IOSYBHtx5hdDJTZ9VtDuqPeRMlbidT6mZD2tga7Q= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hans Verkuil , syzbot+1a35278dd0ebfb3a038a@syzkaller.appspotmail.com, syzbot+397fd082ce5143e2f67d@syzkaller.appspotmail.com, syzbot+06ddf1788cfd048c5e82@syzkaller.appspotmail.com, Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 043/128] media: gspca: zero usb_buf on error Date: Sun, 22 Sep 2019 14:52:53 -0400 Message-Id: <20190922185418.2158-43-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190922185418.2158-1-sashal@kernel.org> References: <20190922185418.2158-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Hans Verkuil [ Upstream commit 4843a543fad3bf8221cf14e5d5f32d15cee89e84 ] If reg_r() fails, then gspca_dev->usb_buf was left uninitialized, and some drivers used the contents of that buffer in logic. This caused several syzbot errors: https://syzkaller.appspot.com/bug?extid=397fd082ce5143e2f67d https://syzkaller.appspot.com/bug?extid=1a35278dd0ebfb3a038a https://syzkaller.appspot.com/bug?extid=06ddf1788cfd048c5e82 I analyzed the gspca drivers and zeroed the buffer where needed. Reported-and-tested-by: syzbot+1a35278dd0ebfb3a038a@syzkaller.appspotmail.com Reported-and-tested-by: syzbot+397fd082ce5143e2f67d@syzkaller.appspotmail.com Reported-and-tested-by: syzbot+06ddf1788cfd048c5e82@syzkaller.appspotmail.com Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/gspca/konica.c | 5 +++++ drivers/media/usb/gspca/nw80x.c | 5 +++++ drivers/media/usb/gspca/ov519.c | 10 ++++++++++ drivers/media/usb/gspca/ov534.c | 5 +++++ drivers/media/usb/gspca/ov534_9.c | 1 + drivers/media/usb/gspca/se401.c | 5 +++++ drivers/media/usb/gspca/sn9c20x.c | 5 +++++ drivers/media/usb/gspca/sonixb.c | 5 +++++ drivers/media/usb/gspca/sonixj.c | 5 +++++ drivers/media/usb/gspca/spca1528.c | 5 +++++ drivers/media/usb/gspca/sq930x.c | 5 +++++ drivers/media/usb/gspca/sunplus.c | 5 +++++ drivers/media/usb/gspca/vc032x.c | 5 +++++ drivers/media/usb/gspca/w996Xcf.c | 5 +++++ 14 files changed, 71 insertions(+) diff --git a/drivers/media/usb/gspca/konica.c b/drivers/media/usb/gspca/konica.c index 989ae997f66de..89b9293b31bef 100644 --- a/drivers/media/usb/gspca/konica.c +++ b/drivers/media/usb/gspca/konica.c @@ -123,6 +123,11 @@ static void reg_r(struct gspca_dev *gspca_dev, u16 value, u16 index) if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, 2); } } diff --git a/drivers/media/usb/gspca/nw80x.c b/drivers/media/usb/gspca/nw80x.c index bedc04a72e97e..bde4441f935e7 100644 --- a/drivers/media/usb/gspca/nw80x.c +++ b/drivers/media/usb/gspca/nw80x.c @@ -1581,6 +1581,11 @@ static void reg_r(struct gspca_dev *gspca_dev, if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); return; } if (len == 1) diff --git a/drivers/media/usb/gspca/ov519.c b/drivers/media/usb/gspca/ov519.c index 10fcbe9e8614b..cb41e61d50dd3 100644 --- a/drivers/media/usb/gspca/ov519.c +++ b/drivers/media/usb/gspca/ov519.c @@ -2083,6 +2083,11 @@ static int reg_r(struct sd *sd, u16 index) } else { gspca_err(gspca_dev, "reg_r %02x failed %d\n", index, ret); sd->gspca_dev.usb_err = ret; + /* + * Make sure the result is zeroed to avoid uninitialized + * values. + */ + gspca_dev->usb_buf[0] = 0; } return ret; @@ -2111,6 +2116,11 @@ static int reg_r8(struct sd *sd, } else { gspca_err(gspca_dev, "reg_r8 %02x failed %d\n", index, ret); sd->gspca_dev.usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, 8); } return ret; diff --git a/drivers/media/usb/gspca/ov534.c b/drivers/media/usb/gspca/ov534.c index d06dc0755b9a5..9e3326b66c792 100644 --- a/drivers/media/usb/gspca/ov534.c +++ b/drivers/media/usb/gspca/ov534.c @@ -642,6 +642,11 @@ static u8 ov534_reg_read(struct gspca_dev *gspca_dev, u16 reg) if (ret < 0) { pr_err("read failed %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the result is zeroed to avoid uninitialized + * values. + */ + gspca_dev->usb_buf[0] = 0; } return gspca_dev->usb_buf[0]; } diff --git a/drivers/media/usb/gspca/ov534_9.c b/drivers/media/usb/gspca/ov534_9.c index 3d1364d2f83e6..4d4ae22e96406 100644 --- a/drivers/media/usb/gspca/ov534_9.c +++ b/drivers/media/usb/gspca/ov534_9.c @@ -1154,6 +1154,7 @@ static u8 reg_r(struct gspca_dev *gspca_dev, u16 reg) if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + return 0; } return gspca_dev->usb_buf[0]; } diff --git a/drivers/media/usb/gspca/se401.c b/drivers/media/usb/gspca/se401.c index 477da0664b7da..40b87717bb5c5 100644 --- a/drivers/media/usb/gspca/se401.c +++ b/drivers/media/usb/gspca/se401.c @@ -111,6 +111,11 @@ static void se401_read_req(struct gspca_dev *gspca_dev, u16 req, int silent) pr_err("read req failed req %#04x error %d\n", req, err); gspca_dev->usb_err = err; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, READ_REQ_SIZE); } } diff --git a/drivers/media/usb/gspca/sn9c20x.c b/drivers/media/usb/gspca/sn9c20x.c index cfa2a04d9f3f6..a4ae029818586 100644 --- a/drivers/media/usb/gspca/sn9c20x.c +++ b/drivers/media/usb/gspca/sn9c20x.c @@ -918,6 +918,11 @@ static void reg_r(struct gspca_dev *gspca_dev, u16 reg, u16 length) if (unlikely(result < 0 || result != length)) { pr_err("Read register %02x failed %d\n", reg, result); gspca_dev->usb_err = result; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); } } diff --git a/drivers/media/usb/gspca/sonixb.c b/drivers/media/usb/gspca/sonixb.c index 5f3f2979540a6..22de65d840dd3 100644 --- a/drivers/media/usb/gspca/sonixb.c +++ b/drivers/media/usb/gspca/sonixb.c @@ -462,6 +462,11 @@ static void reg_r(struct gspca_dev *gspca_dev, dev_err(gspca_dev->v4l2_dev.dev, "Error reading register %02x: %d\n", value, res); gspca_dev->usb_err = res; + /* + * Make sure the result is zeroed to avoid uninitialized + * values. + */ + gspca_dev->usb_buf[0] = 0; } } diff --git a/drivers/media/usb/gspca/sonixj.c b/drivers/media/usb/gspca/sonixj.c index df8d8482b7959..fa108ce000ad6 100644 --- a/drivers/media/usb/gspca/sonixj.c +++ b/drivers/media/usb/gspca/sonixj.c @@ -1171,6 +1171,11 @@ static void reg_r(struct gspca_dev *gspca_dev, if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); } } diff --git a/drivers/media/usb/gspca/spca1528.c b/drivers/media/usb/gspca/spca1528.c index d25924e430f37..a20eb8580db2e 100644 --- a/drivers/media/usb/gspca/spca1528.c +++ b/drivers/media/usb/gspca/spca1528.c @@ -80,6 +80,11 @@ static void reg_r(struct gspca_dev *gspca_dev, if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); } } diff --git a/drivers/media/usb/gspca/sq930x.c b/drivers/media/usb/gspca/sq930x.c index d7cbcf2b39479..3521f5ff428e9 100644 --- a/drivers/media/usb/gspca/sq930x.c +++ b/drivers/media/usb/gspca/sq930x.c @@ -434,6 +434,11 @@ static void reg_r(struct gspca_dev *gspca_dev, if (ret < 0) { pr_err("reg_r %04x failed %d\n", value, ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); } } diff --git a/drivers/media/usb/gspca/sunplus.c b/drivers/media/usb/gspca/sunplus.c index 437a3367ab974..26eae69a2562f 100644 --- a/drivers/media/usb/gspca/sunplus.c +++ b/drivers/media/usb/gspca/sunplus.c @@ -264,6 +264,11 @@ static void reg_r(struct gspca_dev *gspca_dev, if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); } } diff --git a/drivers/media/usb/gspca/vc032x.c b/drivers/media/usb/gspca/vc032x.c index 52d0716596343..6e32264d3825a 100644 --- a/drivers/media/usb/gspca/vc032x.c +++ b/drivers/media/usb/gspca/vc032x.c @@ -2915,6 +2915,11 @@ static void reg_r_i(struct gspca_dev *gspca_dev, if (ret < 0) { pr_err("reg_r err %d\n", ret); gspca_dev->usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(gspca_dev->usb_buf, 0, USB_BUF_SZ); } } static void reg_r(struct gspca_dev *gspca_dev, diff --git a/drivers/media/usb/gspca/w996Xcf.c b/drivers/media/usb/gspca/w996Xcf.c index abfab3de18662..ef0a839f9b8ae 100644 --- a/drivers/media/usb/gspca/w996Xcf.c +++ b/drivers/media/usb/gspca/w996Xcf.c @@ -143,6 +143,11 @@ static int w9968cf_read_sb(struct sd *sd) } else { pr_err("Read SB reg [01] failed\n"); sd->gspca_dev.usb_err = ret; + /* + * Make sure the buffer is zeroed to avoid uninitialized + * values. + */ + memset(sd->gspca_dev.usb_buf, 0, 2); } udelay(W9968CF_I2C_BUS_DELAY); -- 2.20.1