From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Date: Fri, 11 Oct 2019 14:11:15 +0000 Subject: [PATCH v2] USB: legousbtower: fix a signedness bug in tower_probe() Message-Id: <20191011141115.GA4521@mwanda> List-Id: In-Reply-To: <5DA088DE.5040902@bfs.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Juergen Stuber , Johan Hovold Cc: Greg Kroah-Hartman , legousb-devel@lists.sourceforge.net, linux-usb@vger.kernel.org, kernel-janitors@vger.kernel.org, walter harms The problem is that sizeof() is unsigned long so negative error codes are type promoted to high positive values and the condition becomes false. Fixes: 1d427be4a39d ("USB: legousbtower: fix slab info leak at probe") Signed-off-by: Dan Carpenter --- v2: style improvement suggested by Walter Harms. drivers/usb/misc/legousbtower.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c index 9d4c52a7ebe0..9bd240df8f4c 100644 --- a/drivers/usb/misc/legousbtower.c +++ b/drivers/usb/misc/legousbtower.c @@ -881,7 +881,7 @@ static int tower_probe (struct usb_interface *interface, const struct usb_device get_version_reply, sizeof(*get_version_reply), 1000); - if (result < sizeof(*get_version_reply)) { + if (result != sizeof(*get_version_reply)) { if (result >= 0) result = -EIO; dev_err(idev, "get version request failed: %d\n", result); -- 2.20.1 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=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_SANE_1 autolearn=ham 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 A59B9C47404 for ; 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Fri, 11 Oct 2019 14:11:24 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x9BEBNQa024250; Fri, 11 Oct 2019 14:11:23 GMT Received: from mwanda (/41.57.98.10) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 11 Oct 2019 14:11:22 +0000 Date: Fri, 11 Oct 2019 17:11:15 +0300 From: Dan Carpenter To: Juergen Stuber , Johan Hovold Cc: Greg Kroah-Hartman , legousb-devel@lists.sourceforge.net, linux-usb@vger.kernel.org, kernel-janitors@vger.kernel.org, walter harms Subject: [PATCH v2] USB: legousbtower: fix a signedness bug in tower_probe() Message-ID: <20191011141115.GA4521@mwanda> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5DA088DE.5040902@bfs.de> X-Mailer: git-send-email haha only kidding User-Agent: Mutt/1.10.1 (2018-07-13) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9406 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910110133 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9406 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910110133 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The problem is that sizeof() is unsigned long so negative error codes are type promoted to high positive values and the condition becomes false. Fixes: 1d427be4a39d ("USB: legousbtower: fix slab info leak at probe") Signed-off-by: Dan Carpenter --- v2: style improvement suggested by Walter Harms. drivers/usb/misc/legousbtower.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c index 9d4c52a7ebe0..9bd240df8f4c 100644 --- a/drivers/usb/misc/legousbtower.c +++ b/drivers/usb/misc/legousbtower.c @@ -881,7 +881,7 @@ static int tower_probe (struct usb_interface *interface, const struct usb_device get_version_reply, sizeof(*get_version_reply), 1000); - if (result < sizeof(*get_version_reply)) { + if (result != sizeof(*get_version_reply)) { if (result >= 0) result = -EIO; dev_err(idev, "get version request failed: %d\n", result); -- 2.20.1