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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 B4C5FC07E95 for ; Sun, 4 Jul 2021 23:14:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DEF261283 for ; Sun, 4 Jul 2021 23:14:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232580AbhGDXQr (ORCPT ); Sun, 4 Jul 2021 19:16:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:56970 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233546AbhGDXOb (ORCPT ); Sun, 4 Jul 2021 19:14:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 149006198D; Sun, 4 Jul 2021 23:10:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625440209; bh=LYo60E9hzNfnIeU6O7W5VONI9WogMKheLf5JCQtvhwA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Dzw0pvwHLokhgmlkcoA+rxxEpcK13PsjRQtegs65z+8PQuEvSCkY8s7b8YtfVKqc6 GlasbKlNkMKTTZJGqeHREAtvkC/SnNiJqOMDV+czmvkX51IfLcjCctY84El8i9ng1s iX+811bPEGjeXU3GIu2f+68zHO/rLbcvzNXTrFQYr9PmPBOo7s4DB3VjTcd2QddOaJ IY1pGb21NAuDMLGHbDMKqW5/yffqYZhkl5BlQoCs8swOVlXfcN5brlHI/3vSHz5SF/ lkmKPP6IcC3Aic2rErNQ6Zw8ksMbGZ2s7vUaIOqwjwefFL20QkN/wD1+8C9KYl/rzG oHcV9DKy4jXCQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lv Yunlong , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 24/50] media: v4l2-core: Avoid the dangling pointer in v4l2_fh_release Date: Sun, 4 Jul 2021 19:09:12 -0400 Message-Id: <20210704230938.1490742-24-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210704230938.1490742-1-sashal@kernel.org> References: <20210704230938.1490742-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lv Yunlong [ Upstream commit 7dd0c9e547b6924e18712b6b51aa3cba1896ee2c ] A use after free bug caused by the dangling pointer filp->privitate_data in v4l2_fh_release. See https://lore.kernel.org/patchwork/patch/1419058/. My patch sets the dangling pointer to NULL to provide robust. Signed-off-by: Lv Yunlong Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/v4l2-core/v4l2-fh.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c index 684574f58e82..90eec79ee995 100644 --- a/drivers/media/v4l2-core/v4l2-fh.c +++ b/drivers/media/v4l2-core/v4l2-fh.c @@ -96,6 +96,7 @@ int v4l2_fh_release(struct file *filp) v4l2_fh_del(fh); v4l2_fh_exit(fh); kfree(fh); + filp->private_data = NULL; } return 0; } -- 2.30.2