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Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , "linux-sctp@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "lvc-project@linuxtesting.org" Subject: [PATCH net v2] sctp: fix a potential buffer overflow in sctp_sched_set_sched() Thread-Topic: [PATCH net v2] sctp: fix a potential buffer overflow in sctp_sched_set_sched() Thread-Index: AQHZfPZ6+AjI4Yq7k0+w8RGcNMvKHg== Date: Tue, 2 May 2023 13:03:24 +0000 Message-ID: <20230502130316.2680585-1-Ilia.Gavrilov@infotecs.ru> References: In-Reply-To: Accept-Language: ru-RU, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.17.0.10] x-exclaimer-md-config: 208ac3cd-1ed4-4982-a353-bdefac89ac0a MIME-Version: 1.0 X-KLMS-Rule-ID: 1 X-KLMS-Message-Action: clean X-KLMS-AntiSpam-Lua-Profiles: 177118 [May 02 2023] X-KLMS-AntiSpam-Version: 5.9.59.0 X-KLMS-AntiSpam-Envelope-From: Ilia.Gavrilov@infotecs.ru X-KLMS-AntiSpam-Rate: 0 X-KLMS-AntiSpam-Status: not_detected X-KLMS-AntiSpam-Method: none X-KLMS-AntiSpam-Auth: dkim=none X-KLMS-AntiSpam-Info: LuaCore: 510 510 bc345371020d3ce827abc4c710f5f0ecf15eaf2e, {Tracking_from_domain_doesnt_match_to}, 127.0.0.199:7.1.2;infotecs.ru:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1 X-MS-Exchange-Organization-SCL: -1 X-KLMS-AntiSpam-Interceptor-Info: scan successful X-KLMS-AntiPhishing: Clean, bases: 2023/05/02 11:01:00 X-KLMS-AntiVirus: Kaspersky Security for Linux Mail Server, version 8.0.3.30, bases: 2023/05/02 09:07:00 #21205017 X-KLMS-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1764771379885762667?= X-GMAIL-MSGID: =?utf-8?q?1764787821454024431?= The 'sched' index value must be checked before accessing an element of the 'sctp_sched_ops' array. Otherwise, it can lead to buffer overflow. Note that it's harmless since the 'sched' parameter is checked before calling 'sctp_sched_set_sched'. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations") Reviewed-by: Simon Horman Signed-off-by: Ilia.Gavrilov Reviewed-by: Xin Long --- V2: - Change the order of local variables - Specify the target tree in the subject net/sctp/stream_sched.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/net/sctp/stream_sched.c b/net/sctp/stream_sched.c index 330067002deb..4d076a9b8592 100644 --- a/net/sctp/stream_sched.c +++ b/net/sctp/stream_sched.c @@ -146,18 +146,19 @@ static void sctp_sched_free_sched(struct sctp_stream *stream) int sctp_sched_set_sched(struct sctp_association *asoc, enum sctp_sched_type sched) { - struct sctp_sched_ops *n = sctp_sched_ops[sched]; struct sctp_sched_ops *old = asoc->outqueue.sched; struct sctp_datamsg *msg = NULL; + struct sctp_sched_ops *n; struct sctp_chunk *ch; int i, ret = 0; - if (old == n) - return ret; - if (sched > SCTP_SS_MAX) return -EINVAL; + n = sctp_sched_ops[sched]; + if (old == n) + return ret; + if (old) sctp_sched_free_sched(&asoc->stream);