Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754693AbeAAPPE (ORCPT + 1 other); Mon, 1 Jan 2018 10:15:04 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:43774 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753244AbeAAOgN (ORCPT ); Mon, 1 Jan 2018 09:36:13 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Juan Zea , Shuah Khan Subject: [PATCH 4.9 57/75] usbip: fix usbip bind writing random string after command in match_busid Date: Mon, 1 Jan 2018 15:32:34 +0100 Message-Id: <20180101140106.167585848@linuxfoundation.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180101140056.475827799@linuxfoundation.org> References: <20180101140056.475827799@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Juan Zea commit 544c4605acc5ae4afe7dd5914147947db182f2fb upstream. usbip bind writes commands followed by random string when writing to match_busid attribute in sysfs, caused by using full variable size instead of string length. Signed-off-by: Juan Zea Acked-by: Shuah Khan Signed-off-by: Greg Kroah-Hartman --- tools/usb/usbip/src/utils.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/tools/usb/usbip/src/utils.c +++ b/tools/usb/usbip/src/utils.c @@ -30,6 +30,7 @@ int modify_match_busid(char *busid, int char command[SYSFS_BUS_ID_SIZE + 4]; char match_busid_attr_path[SYSFS_PATH_MAX]; int rc; + int cmd_size; snprintf(match_busid_attr_path, sizeof(match_busid_attr_path), "%s/%s/%s/%s/%s/%s", SYSFS_MNT_PATH, SYSFS_BUS_NAME, @@ -37,12 +38,14 @@ int modify_match_busid(char *busid, int attr_name); if (add) - snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s", busid); + cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s", + busid); else - snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s", busid); + cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s", + busid); rc = write_sysfs_attribute(match_busid_attr_path, command, - sizeof(command)); + cmd_size); if (rc < 0) { dbg("failed to write match_busid: %s", strerror(errno)); return -1;