From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E44AC7E101 for ; Sun, 1 Sep 2024 07:39:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725176370; cv=none; b=qbRvADGtnyZyi+fXIsfSNrUs+Iswh6oABPsSsM07ZF8WUkmsjf6wUdvpPY9PquSKJp+ISHwQuabjxKbn2WmiU6b2LNJtzqT8onGMZN55EauVTQZI46HX98UTtKwtEN2n5OfXFov6WaGdta8lwS7ECKgtcYiWlA4mbUcePClJeNk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725176370; c=relaxed/simple; bh=aA7PRBVXeURc0y4haGj3b8s3j8jYM8sH8nwHmA2n6zA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=OdowVkVQ29gKdGF7SW+Blv+0yQnf9K5ZhDUZzPHJVmzQfmKs9Qemk/ZGMLCOkbhocmrxnDb/rT4sxfiZBfTznMSSnFlSb4qzQgyIrfUDFV5XUHiJ+IksjQNQRqdmddJEydHGDRv8yKbwb7GcumpiMQjtfqpeR+cfzI8PIFVC9WY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f200.google.com with SMTP id e9e14a558f8ab-39d4b5b9fa0so40230825ab.1 for ; Sun, 01 Sep 2024 00:39:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725176368; x=1725781168; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=xUfKU43Y0F3kPZOkwB+JSr6rYJBGPcvBjhYK8OyoDvM=; b=bOeuZCGZjwtehygRBIA9iAtLGm0mMzBUbdS55VfpiFZo9xdo+NquSe2rbDTqAzE+JJ ud6CBS2d8yJSNdQJh0nCbsMAc0RFtRFPQiJr9Q0ALsj74JU4PvmuboNDsyK5wJIGJJIo PMsF5kwh3/diuCXiZSDqy5pvx2i9dsV78E7ndCyU9agvcUICcYMkB6C4NVlmAGRpcAHx zeokUrcZeevhdviRIOQ+f0SuAUoR5VqsajlZoRawJEvHlEm+IA4bXLMqoFXu1QpQ08+R fLlR57QjzDBFV9bPCJpOSKji00X28y3kmQpoKAKn5ciIwYFBL+LcQVEAf1lwNYx8ygJf aAyg== X-Forwarded-Encrypted: i=1; AJvYcCV2JjcMUWXTv6mkagSrmn1WoX+Mv0wYB20IcCNLB0q6K4SVmTmD6dTC63G+7VCnuTHbf73KZd/OkBlj+qHOlXI=@vger.kernel.org X-Gm-Message-State: AOJu0YygONZsmjq1CRDuLieC8Fbz8ZraYxsH3gVSAevKuTS0pLUYfsX2 bBO6LaDrnzBEbgNN8+Y9q/tN31mh7Ce1kU6hWqd+1Tlzk0qA8+SCNn0c0CL6L9ahDWhW4drden8 cDCgg50zJrw62yZw/bZfN40ftzbDD0z2xOcTHrnDUCiOxq7Etq9CRrZw= X-Google-Smtp-Source: AGHT+IFJmiPebFmp8ZPNjSW7Ap7vhs7XgThHVj2oE0FS1Okr7LH+V8qyPxGD3dp6mkKRZAreo1BmAxxKnczd+OsCPJBAsE5xJVy+ Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1d83:b0:39d:3043:1f20 with SMTP id e9e14a558f8ab-39f410838a3mr5885555ab.5.1725176367961; Sun, 01 Sep 2024 00:39:27 -0700 (PDT) Date: Sun, 01 Sep 2024 00:39:27 -0700 In-Reply-To: <000000000000e43c5106170f2fb4@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000096680f062109ec63@google.com> Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in l2cap_recv_frame From: syzbot To: johan.hedberg@gmail.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: e8784b0aef62 Merge tag 'usb-6.11-rc6' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1600ea63980000 kernel config: https://syzkaller.appspot.com/x/.config?x=b3e19fd08b312452 dashboard link: https://syzkaller.appspot.com/bug?extid=5c915dc5dd417b83b348 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13ba6d1f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10dfdadb980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e1d3f7f323a8/disk-e8784b0a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/01c01dcebf01/vmlinux-e8784b0a.xz kernel image: https://storage.googleapis.com/syzbot-assets/53cc8ab0ce4d/bzImage-e8784b0a.xz Bisection is inconclusive: the first bad commit could be any of: b79e04091010 Bluetooth: btintel: Fix null ptr deref in btintel_read_version e7b02296fb40 Bluetooth: Remove BT_HS bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17d8bd73980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5c915dc5dd417b83b348@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in l2cap_conless_channel net/bluetooth/l2cap_core.c:6757 [inline] BUG: KMSAN: uninit-value in l2cap_recv_frame+0xc9c5/0x18b10 net/bluetooth/l2cap_core.c:6831 l2cap_conless_channel net/bluetooth/l2cap_core.c:6757 [inline] l2cap_recv_frame+0xc9c5/0x18b10 net/bluetooth/l2cap_core.c:6831 l2cap_recv_acldata+0xdd9/0x2ac0 net/bluetooth/l2cap_core.c:7514 hci_acldata_packet net/bluetooth/hci_core.c:3791 [inline] hci_rx_work+0xb38/0x1130 net/bluetooth/hci_core.c:4028 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3312 worker_thread+0xea7/0x14d0 kernel/workqueue.c:3389 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: slab_post_alloc_hook mm/slub.c:3994 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4080 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:583 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:674 alloc_skb include/linux/skbuff.h:1320 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:493 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:487 [inline] vhci_write+0x128/0x910 drivers/bluetooth/hci_vhci.c:607 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xb2f/0x1550 fs/read_write.c:590 ksys_write+0x20f/0x4c0 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x93/0xe0 fs/read_write.c:652 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 0 UID: 0 PID: 5180 Comm: kworker/u9:2 Not tainted 6.11.0-rc5-syzkaller-00310-ge8784b0aef62 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci0 hci_rx_work ===================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.