From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (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 4DEF2235C01 for ; Fri, 24 Jul 2026 11:54:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784894070; cv=none; b=GTn/srnQJYMSkG+08UDDaM/DXKuCGSZPLV9uAgYros1touP1kaflDGEhOtVU6yaB4ZjCumo7UOrFeJz4JpNREOhq594Plh/MclUNmjLDfowE0Bb92dy192x6WgzYwIy5k3pi6jfbNHk66t/E6SmFefj/3HXnI6LtvxlcFgyiEJk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784894070; c=relaxed/simple; bh=LSm2YeYzYxIdKZxksJ/Z9m5X3nUiIrS9TZOKX5QkOo8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=mP8ADxTjj8BvBEFHG4uofdqZKUxgkm6nETCnl2LLIUAczfyqptKmODmoJ8kghdRRm/rmyHpvwWnnwJYv1egIF85LMn+PWgzMmp+aZVcW5GWL8qA4o0bjNHGp6W8MHhAEwZ+4FJKGdNez4ofhSybsjfYWbcpZ9da8otY+OM6dmjw= 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=209.85.167.206 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-oi1-f206.google.com with SMTP id 5614622812f47-4a49f09233dso174833b6e.2 for ; Fri, 24 Jul 2026 04:54:28 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784894067; x=1785498867; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=BZrzaXUU4adCoHuav1t7RSHeps+njlzAD+ETtaY+gxo=; b=hoYeQWxQ1exRdHPYATB+7J9KkrHvDm4fbmru6e0ttTOQUOm0/oZA5i4BZ6wxVbmp0R RcWNpbSRHvKSiYt/JJNy0uRWCGqjrVXmq3BeW4ny3JFoYTdeR4PaOZeXcR4IGXCWedfm 1CBEQGW+XowGB1l+fLyrsQutx31be4hMqFLqNw6PCgkN98vONjYXdLYz+VvDbx+gMwT5 X4z5WesIcNZyGGrfnX18YcHwFH8nW8BFNbuS/oNUzoX1s9UEFsYnZ9FvdpaKw9EkLLqx Cd2Wb98bybCw+v1BCJwd8xQPM7tnsnxpbLZTSkbRiXdT7ddT+EMuM1vSiUmjt1Mg7U2w 0yPA== X-Gm-Message-State: AOJu0YwpcZl8KS0tRa2478dcZvIeP87jDqHOg+SJdnTEjbhnm73TwUhm 7gwZYnlo3Y7NkzrO5+9hWKotZVmiFTbty8sxaQl3hs0W9kHvKu35WVAiscWkF7tpCsJD1Cbesxk EKBUYYPsoJ5tnMK6cfpup3/6mTfolYxuSop4HuQn+eCqGlXcX8UTGM38+Td/9/A== Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1646:b0:49f:a87e:2316 with SMTP id 5614622812f47-4ab35497d33mr3972267b6e.31.1784894067184; Fri, 24 Jul 2026 04:54:27 -0700 (PDT) Date: Fri, 24 Jul 2026 04:54:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a635273.dde6c935.cf6c8.001f.GAE@google.com> Subject: [syzbot] [bluetooth?] KASAN: slab-out-of-bounds Read in l2cap_sock_setsockopt (2) From: syzbot To: 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" Hello, syzbot found the following issue on: HEAD commit: c6859eed755d Merge tag 's390-7.2-5' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13fc3789580000 kernel config: https://syzkaller.appspot.com/x/.config?x=48ef5c5c0f192153 dashboard link: https://syzkaller.appspot.com/bug?extid=b106284c2a0b7bc80cf9 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-c6859eed.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9d3a7ae02103/vmlinux-c6859eed.xz kernel image: https://storage.googleapis.com/syzbot-assets/9c6da93fb737/bzImage-c6859eed.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b106284c2a0b7bc80cf9@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in l2cap_sock_setsockopt+0x22c3/0x2330 net/bluetooth/l2cap_sock.c:1003 Read of size 1 at addr ffff88802803c362 by task syz.1.1719/10814 CPU: 1 UID: 0 PID: 10814 Comm: syz.1.1719 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 l2cap_sock_setsockopt+0x22c3/0x2330 net/bluetooth/l2cap_sock.c:1003 do_sock_setsockopt+0xf3/0x1d0 net/socket.c:2368 __sys_setsockopt+0x195/0x220 net/socket.c:2393 __do_sys_setsockopt net/socket.c:2399 [inline] __se_sys_setsockopt net/socket.c:2396 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbdccd9de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbdcaff6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fbdcd025fa0 RCX: 00007fbdccd9de99 RDX: 0000000000000008 RSI: 0000000000000112 RDI: 0000000000000004 RBP: 00007fbdcce33eaf R08: 0000000000000004 R09: 0000000000000000 R10: 00002000000005c0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbdcd026038 R14: 00007fbdcd025fa0 R15: 00007fffc6ab0ee8 The buggy address belongs to the object at ffff88802803c340 which belongs to the cache skbuff_small_head of size 704 The buggy address is located 34 bytes inside of allocated 704-byte region [ffff88802803c340, ffff88802803c600) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2803c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801cb40500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000800130013 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801cb40500 dead000000000122 0000000000000000 head: 0000000000000000 0000000800130013 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2000(__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5813, tgid 5813 (kworker/u32:4), ts 280325981720, free_ts 280258613659 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3294 [inline] allocate_slab mm/slub.c:3408 [inline] new_slab+0xa2/0x650 mm/slub.c:3454 refill_objects+0xe3/0x410 mm/slub.c:7338 refill_sheaf mm/slub.c:2832 [inline] __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4703 alloc_from_pcs mm/slub.c:4801 [inline] slab_alloc_node mm/slub.c:4933 [inline] kmem_cache_alloc_node_noprof+0x52c/0x6b0 mm/slub.c:5017 kmalloc_reserve+0x148/0x350 net/core/skbuff.c:615 __alloc_skb+0x185/0x710 net/core/skbuff.c:715 alloc_skb include/linux/skbuff.h:1384 [inline] alloc_uevent_skb+0x7d/0x210 lib/kobject_uevent.c:289 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline] kobject_uevent_env+0xd2d/0x18b0 lib/kobject_uevent.c:611 device_del+0x605/0x9b0 drivers/base/core.c:3979 device_unregister+0x1d/0xe0 drivers/base/core.c:4002 mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim_main.c:6228 [inline] hwsim_exit_net+0x8c2/0x14f0 drivers/net/wireless/virtual/mac80211_hwsim_main.c:7207 ops_exit_list net/core/net_namespace.c:199 [inline] ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252 cleanup_net+0x499/0x920 net/core/net_namespace.c:702 page last free pid 10776 tgid 10776 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x79f/0x1090 mm/page_alloc.c:2950 hci_release_dev+0x4ef/0x630 net/bluetooth/hci_core.c:2739 bt_host_release+0x6b/0xb0 net/bluetooth/hci_sysfs.c:87 device_release+0xd2/0x270 drivers/base/core.c:2636 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3880 vhci_release+0x185/0x230 drivers/bluetooth/hci_vhci.c:701 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1009 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152 __do_sys_exit_group kernel/exit.c:1163 [inline] __se_sys_exit_group kernel/exit.c:1161 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1161 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802803c200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802803c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802803c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802803c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802803c400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report is generated by a bot. 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