From patchwork Mon Nov 16 13:24:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yongjun X-Patchwork-Id: 324677 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=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 289F1C61DD8 for ; Mon, 16 Nov 2020 13:20:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD3F822280 for ; Mon, 16 Nov 2020 13:20:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728473AbgKPNTo (ORCPT ); Mon, 16 Nov 2020 08:19:44 -0500 Received: from szxga05-in.huawei.com ([45.249.212.191]:7544 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728281AbgKPNTo (ORCPT ); Mon, 16 Nov 2020 08:19:44 -0500 Received: from DGGEMS408-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4CZV67296vzhXs1; Mon, 16 Nov 2020 21:19:27 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS408-HUB.china.huawei.com (10.3.19.208) with Microsoft SMTP Server id 14.3.487.0; Mon, 16 Nov 2020 21:19:29 +0800 From: Wei Yongjun To: =?utf-8?q?Marcel_Holtmann_Johan_Hedberg_Jakub_Kicinski_Joseph_Hwang_A?= =?utf-8?q?lain_Michaud_Abhishek_Pandit-Subedi_Pali_Roh=C3=A1r?= <"marcel@holtmann.orgjohan.hedberg@gmail.comkuba@kernel.orgjosephsih@chromium.orgalainm@chromium.orgabhishekpandit@chromium.orgpali"@kernel.org> CC: Wei Yongjun , , , Hulk Robot Subject: [PATCH] Bluetooth: sco: Fix crash when using BT_SNDMTU/BT_RCVMTU option Date: Mon, 16 Nov 2020 21:24:21 +0800 Message-ID: <20201116132421.94624-1-weiyongjun1@huawei.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This commit add the invalid check for connected socket, without it will causes the following crash due to sco_pi(sk)->conn being NULL: KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] CPU: 3 PID: 4284 Comm: test_sco Not tainted 5.10.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 RIP: 0010:sco_sock_getsockopt+0x45d/0x8e0 Code: 48 c1 ea 03 80 3c 02 00 0f 85 ca 03 00 00 49 8b 9d f8 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e b5 03 00 00 8b 43 50 48 8b 0c RSP: 0018:ffff88801bb17d88 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83a4ecdf RDX: 000000000000000a RSI: ffffc90002fce000 RDI: 0000000000000050 RBP: 1ffff11003762fb4 R08: 0000000000000001 R09: ffff88810e1008c0 R10: ffffffffbd695dcf R11: fffffbfff7ad2bb9 R12: 0000000000000000 R13: ffff888018ff1000 R14: dffffc0000000000 R15: 000000000000000d FS: 00007fb4f76c1700(0000) GS:ffff88811af80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555e3b7a938 CR3: 00000001117be001 CR4: 0000000000770ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: ? sco_skb_put_cmsg+0x80/0x80 ? sco_skb_put_cmsg+0x80/0x80 __sys_getsockopt+0x12a/0x220 ? __ia32_sys_setsockopt+0x150/0x150 ? syscall_enter_from_user_mode+0x18/0x50 ? rcu_read_lock_bh_held+0xb0/0xb0 __x64_sys_getsockopt+0xba/0x150 ? syscall_enter_from_user_mode+0x1d/0x50 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 0fc1a726f897 ("Bluetooth: sco: new getsockopt options BT_SNDMTU/BT_RCVMTU") Reported-by: Hulk Robot Signed-off-by: Wei Yongjun Reviewed-by: Luiz Augusto Von Dentz diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index 79ffcdef0b7a..22a110f37abc 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -1003,6 +1003,11 @@ static int sco_sock_getsockopt(struct socket *sock, int level, int optname, case BT_SNDMTU: case BT_RCVMTU: + if (sk->sk_state != BT_CONNECTED) { + err = -ENOTCONN; + break; + } + if (put_user(sco_pi(sk)->conn->mtu, (u32 __user *)optval)) err = -EFAULT; break;