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Miller" , Pablo Neira Ayuso , Jozsef Kadlecsik , Florian Westphal , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , "Jamal Hadi Salim" , Cong Wang , Jiri Pirko , Patrick McHardy , Jesper Dangaard Brouer , Paolo Abeni , Christoph Paasch , Peter Krystad CC: Young Xiao <92siuyang@gmail.com>, , "Maxim Mikityanskiy" Subject: [PATCH net 3/3] sch_cake: Fix out of bounds when parsing TCP options Date: Wed, 9 Jun 2021 17:22:12 +0300 Message-ID: <20210609142212.3096691-4-maximmi@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210609142212.3096691-1-maximmi@nvidia.com> References: <20210609142212.3096691-1-maximmi@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 68104536-408f-41b1-8e4a-08d92b5216ff X-MS-TrafficTypeDiagnostic: CY4PR12MB1623: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:538; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.34; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:schybrid03.nvidia.com; CAT:NONE; SFS:(4636009)(136003)(346002)(396003)(376002)(39860400002)(36840700001)(46966006)(5660300002)(110136005)(36906005)(54906003)(4326008)(107886003)(316002)(7696005)(2906002)(6666004)(336012)(47076005)(356005)(83380400001)(7416002)(82740400003)(1076003)(26005)(186003)(8676002)(36860700001)(426003)(8936002)(2616005)(70586007)(478600001)(70206006)(7636003)(82310400003)(36756003)(921005)(86362001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2021 14:23:02.1196 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 68104536-408f-41b1-8e4a-08d92b5216ff X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT006.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1623 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The TCP option parser in cake qdisc (cake_get_tcpopt and cake_tcph_may_drop) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1. This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options."). Cc: Young Xiao <92siuyang@gmail.com> Fixes: 8b7138814f29 ("sch_cake: Add optional ACK filter") Signed-off-by: Maxim Mikityanskiy --- net/sched/sch_cake.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c index 7d37638ee1c7..6b03eebf0a78 100644 --- a/net/sched/sch_cake.c +++ b/net/sched/sch_cake.c @@ -967,6 +967,8 @@ static const void *cake_get_tcpopt(const struct tcphdr *tcph, length--; continue; } + if (length < 2) + break; opsize = *ptr++; if (opsize < 2 || opsize > length) break; @@ -1104,6 +1106,8 @@ static bool cake_tcph_may_drop(const struct tcphdr *tcph, length--; continue; } + if (length < 2) + break; opsize = *ptr++; if (opsize < 2 || opsize > length) break;