From patchwork Mon Mar 21 08:33:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans Verkuil X-Patchwork-Id: 553656 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29DAFC433F5 for ; Mon, 21 Mar 2022 08:34:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345333AbiCUIfk (ORCPT ); Mon, 21 Mar 2022 04:35:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345321AbiCUIf1 (ORCPT ); Mon, 21 Mar 2022 04:35:27 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1973A4DF6C for ; Mon, 21 Mar 2022 01:34:01 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BD65EB81144 for ; Mon, 21 Mar 2022 08:33:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34F92C340E8 for ; Mon, 21 Mar 2022 08:33:58 +0000 (UTC) Message-ID: Date: Mon, 21 Mar 2022 09:33:56 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.1 Content-Language: en-US From: Hans Verkuil Subject: [PATCH for 5.18] v4l2-compat-ioctl32.c: zero buffer passed to v4l2_compat_get_array_args() To: Linux Media Mailing List Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The v4l2_compat_get_array_args() function can leave uninitialized memory in the buffer it is passed. So zero it before copying array elements from userspace into the buffer. Signed-off-by: Hans Verkuil Reported-by: syzbot+ff18193ff05f3f87f226@syzkaller.appspotmail.com diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index 0f3d6b5667b0..55c26e7d370e 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -1040,6 +1040,8 @@ int v4l2_compat_get_array_args(struct file *file, void *mbuf, { int err = 0; + memset(mbuf, 0, array_size); + switch (cmd) { case VIDIOC_G_FMT32: case VIDIOC_S_FMT32: