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Thu, 11 Mar 2021 14:42:18 +0000 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 11 Mar 2021 14:42:17 +0000 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 11 Mar 2021 14:42:17 +0000 Received: from vdi.nvidia.com (172.20.145.6) by mail.nvidia.com (172.20.187.10) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 11 Mar 2021 14:42:14 +0000 From: Maxim Mikityanskiy To: Jamal Hadi Salim , Cong Wang , Jiri Pirko CC: "David S. Miller" , Jakub Kicinski , Tariq Toukan , Eric Dumazet , , Maxim Mikityanskiy , Subject: [PATCH net 2/2] sch_htb: Fix offload cleanup in htb_destroy on htb_init failure Date: Thu, 11 Mar 2021 16:42:06 +0200 Message-ID: <20210311144206.2135872-3-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210311144206.2135872-1-maximmi@nvidia.com> References: <20210311144206.2135872-1-maximmi@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: aea3f522-742f-402d-1699-08d8e49bdf08 X-MS-TrafficTypeDiagnostic: DM6PR12MB3226: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1284; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.35; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:schybrid02.nvidia.com; CAT:NONE; SFS:(4636009)(376002)(136003)(346002)(396003)(39860400002)(36840700001)(46966006)(47076005)(26005)(186003)(5660300002)(82740400003)(2906002)(2616005)(34070700002)(83380400001)(478600001)(36860700001)(426003)(356005)(336012)(4326008)(8936002)(7636003)(86362001)(54906003)(8676002)(6666004)(110136005)(36906005)(316002)(1076003)(7696005)(70586007)(70206006)(82310400003)(36756003); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2021 14:42:18.4319 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: aea3f522-742f-402d-1699-08d8e49bdf08 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.35]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT013.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3226 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org htb_init may fail to do the offload if it's not supported or if a runtime error happens when allocating direct qdiscs. In those cases TC_HTB_CREATE command is not sent to the driver, however, htb_destroy gets called anyway and attempts to send TC_HTB_DESTROY. It shouldn't happen, because the driver didn't receive TC_HTB_CREATE, and also because the driver may not support ndo_setup_tc at all, while q->offload is true, and htb_destroy mistakenly thinks the offload is supported. Trying to call ndo_setup_tc in the latter case will lead to a NULL pointer dereference. This commit fixes the issues with htb_destroy by deferring assignment of q->offload until after the TC_HTB_CREATE command. The necessary cleanup of the offload entities is already done in htb_init. Reported-by: syzbot+b53a709f04722ca12a3c@syzkaller.appspotmail.com Fixes: d03b195b5aa0 ("sch_htb: Hierarchical QoS hardware offload") Suggested-by: Eric Dumazet Signed-off-by: Maxim Mikityanskiy Reviewed-by: Tariq Toukan --- net/sched/sch_htb.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c index b23203159996..62e12cb41a3e 100644 --- a/net/sched/sch_htb.c +++ b/net/sched/sch_htb.c @@ -1020,6 +1020,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, struct nlattr *tb[TCA_HTB_MAX + 1]; struct tc_htb_glob *gopt; unsigned int ntx; + bool offload; int err; qdisc_watchdog_init(&q->watchdog, sch); @@ -1044,9 +1045,9 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, if (gopt->version != HTB_VER >> 16) return -EINVAL; - q->offload = nla_get_flag(tb[TCA_HTB_OFFLOAD]); + offload = nla_get_flag(tb[TCA_HTB_OFFLOAD]); - if (q->offload) { + if (offload) { if (sch->parent != TC_H_ROOT) return -EOPNOTSUPP; @@ -1076,7 +1077,7 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, q->rate2quantum = 1; q->defcls = gopt->defcls; - if (!q->offload) + if (!offload) return 0; for (ntx = 0; ntx < q->num_direct_qdiscs; ntx++) { @@ -1107,12 +1108,14 @@ static int htb_init(struct Qdisc *sch, struct nlattr *opt, if (err) goto err_free_qdiscs; + /* Defer this assignment, so that htb_destroy skips offload-related + * parts (especially calling ndo_setup_tc) on errors. + */ + q->offload = true; + return 0; err_free_qdiscs: - /* TC_HTB_CREATE call failed, avoid any further calls to the driver. */ - q->offload = false; - for (ntx = 0; ntx < q->num_direct_qdiscs && q->direct_qdiscs[ntx]; ntx++) qdisc_put(q->direct_qdiscs[ntx]);