From owner-svn-src-head@freebsd.org Thu Apr 13 17:34:53 2017 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 49F54D3BFC7; Thu, 13 Apr 2017 17:34:53 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 02107CF1; Thu, 13 Apr 2017 17:34:52 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v3DHYqMO050434; Thu, 13 Apr 2017 17:34:52 GMT (envelope-from cem@FreeBSD.org) Received: (from cem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v3DHYqAm050433; Thu, 13 Apr 2017 17:34:52 GMT (envelope-from cem@FreeBSD.org) Message-Id: <201704131734.v3DHYqAm050433@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: cem set sender to cem@FreeBSD.org using -f From: Conrad Meyer Date: Thu, 13 Apr 2017 17:34:52 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r316776 - head/sys/compat/linux X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Apr 2017 17:34:53 -0000 Author: cem Date: Thu Apr 13 17:34:51 2017 New Revision: 316776 URL: https://svnweb.freebsd.org/changeset/base/316776 Log: linux_ioctl: Refactor some v4l2 struct converters According to the C standard, it is invalid to copy beyond the end of an object, even if that object is obviously a member of a larger object (a struct, in this case). Appease the standard and Coverity by refactoring the copy in a straightforward way. No functional change. Reported by: Coverity (CWE-120) CIDs: 1007819, 1007820, 1007821, 1007822, 1009668, 1009669 Security: no (false positive detection) Sponsored by: Dell EMC Isilon Modified: head/sys/compat/linux/linux_ioctl.c Modified: head/sys/compat/linux/linux_ioctl.c ============================================================================== --- head/sys/compat/linux/linux_ioctl.c Thu Apr 13 17:30:33 2017 (r316775) +++ head/sys/compat/linux/linux_ioctl.c Thu Apr 13 17:34:51 2017 (r316776) @@ -3185,7 +3185,12 @@ linux_to_bsd_v4l2_standard(struct l_v4l2 { vstd->index = lvstd->index; vstd->id = lvstd->id; - memcpy(&vstd->name, &lvstd->name, sizeof(*lvstd) - offsetof(struct l_v4l2_standard, name)); + CTASSERT(sizeof(vstd->name) == sizeof(lvstd->name)); + memcpy(vstd->name, lvstd->name, sizeof(vstd->name)); + vstd->frameperiod = lvstd->frameperiod; + vstd->framelines = lvstd->framelines; + CTASSERT(sizeof(vstd->reserved) == sizeof(lvstd->reserved)); + memcpy(vstd->reserved, lvstd->reserved, sizeof(vstd->reserved)); return (0); } @@ -3194,7 +3199,12 @@ bsd_to_linux_v4l2_standard(struct v4l2_s { lvstd->index = vstd->index; lvstd->id = vstd->id; - memcpy(&lvstd->name, &vstd->name, sizeof(*lvstd) - offsetof(struct l_v4l2_standard, name)); + CTASSERT(sizeof(vstd->name) == sizeof(lvstd->name)); + memcpy(lvstd->name, vstd->name, sizeof(lvstd->name)); + lvstd->frameperiod = vstd->frameperiod; + lvstd->framelines = vstd->framelines; + CTASSERT(sizeof(vstd->reserved) == sizeof(lvstd->reserved)); + memcpy(lvstd->reserved, vstd->reserved, sizeof(lvstd->reserved)); return (0); }