From patchwork Mon Mar 6 14:21:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Reshetova, Elena" X-Patchwork-Id: 9606665 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0B0A6604DD for ; Mon, 6 Mar 2017 14:33:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F39C126490 for ; Mon, 6 Mar 2017 14:33:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E6D0E26E69; Mon, 6 Mar 2017 14:33:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 687EF26907 for ; Mon, 6 Mar 2017 14:33:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754652AbdCFOdN (ORCPT ); Mon, 6 Mar 2017 09:33:13 -0500 Received: from mga07.intel.com ([134.134.136.100]:25786 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753940AbdCFO3s (ORCPT ); Mon, 6 Mar 2017 09:29:48 -0500 Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP; 06 Mar 2017 06:22:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,254,1484035200"; d="scan'208";a="72746142" Received: from rzetikx-mobl.ger.corp.intel.com (HELO elena-ThinkPad-X230.ger.corp.intel.com) ([10.249.41.1]) by fmsmga005.fm.intel.com with ESMTP; 06 Mar 2017 06:22:41 -0800 From: Elena Reshetova To: gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, netdev@vger.kernel.org, linux1394-devel@lists.sourceforge.net, linux-bcache@vger.kernel.org, linux-raid@vger.kernel.org, linux-media@vger.kernel.org, devel@linuxdriverproject.org, linux-pci@vger.kernel.org, linux-s390@vger.kernel.org, fcoe-devel@open-fcoe.org, linux-scsi@vger.kernel.org, open-iscsi@googlegroups.com, devel@driverdev.osuosl.org, target-devel@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, peterz@infradead.org, Elena Reshetova , Hans Liljestrand , Kees Cook , David Windsor Subject: [PATCH 13/29] drivers, media: convert vb2_vmarea_handler.refcount from atomic_t to refcount_t Date: Mon, 6 Mar 2017 16:21:00 +0200 Message-Id: <1488810076-3754-14-git-send-email-elena.reshetova@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1488810076-3754-1-git-send-email-elena.reshetova@intel.com> References: <1488810076-3754-1-git-send-email-elena.reshetova@intel.com> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor --- drivers/media/v4l2-core/videobuf2-memops.c | 6 +++--- include/media/videobuf2-memops.h | 3 ++- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf2-memops.c b/drivers/media/v4l2-core/videobuf2-memops.c index 1cd322e..4bb8424 100644 --- a/drivers/media/v4l2-core/videobuf2-memops.c +++ b/drivers/media/v4l2-core/videobuf2-memops.c @@ -96,10 +96,10 @@ static void vb2_common_vm_open(struct vm_area_struct *vma) struct vb2_vmarea_handler *h = vma->vm_private_data; pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n", - __func__, h, atomic_read(h->refcount), vma->vm_start, + __func__, h, refcount_read(h->refcount), vma->vm_start, vma->vm_end); - atomic_inc(h->refcount); + refcount_inc(h->refcount); } /** @@ -114,7 +114,7 @@ static void vb2_common_vm_close(struct vm_area_struct *vma) struct vb2_vmarea_handler *h = vma->vm_private_data; pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n", - __func__, h, atomic_read(h->refcount), vma->vm_start, + __func__, h, refcount_read(h->refcount), vma->vm_start, vma->vm_end); h->put(h->arg); diff --git a/include/media/videobuf2-memops.h b/include/media/videobuf2-memops.h index 36565c7a..a6ed091 100644 --- a/include/media/videobuf2-memops.h +++ b/include/media/videobuf2-memops.h @@ -16,6 +16,7 @@ #include #include +#include /** * struct vb2_vmarea_handler - common vma refcount tracking handler @@ -25,7 +26,7 @@ * @arg: argument for @put callback */ struct vb2_vmarea_handler { - atomic_t *refcount; + refcount_t *refcount; void (*put)(void *arg); void *arg; };