From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) (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 D17BF33B6EF for ; Wed, 7 Oct 2026 02:36:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791340593; cv=none; b=s+b3Sfr34eWbYpkDFjZh5+fEsKsAbmYuGKamVbAaDS5HOVp9gBWJECSY8SO9mdBd9GjxaqAPTwkQ4zjvLxJjJENyGg/xxtkvjHsU7mkB6BJvZss/O63W94DWJ4/3LxinxE0sb66wgaY5JaR9jLT9u0fYBFG/65Im45Fq7AG3WAo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791340593; c=relaxed/simple; bh=hdN9Mvek8+9pJSrUMa+ORA3mcToX2aU5HpCB0qIkr1M=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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2002:a05:6808:19a3:b0:4b3:98f4:f057 with SMTP id 5614622812f47-4fc436fb3c3mr1295934b6e.3.1791340590785; Tue, 06 Oct 2026 19:36:30 -0700 (PDT) Date: Tue, 06 Oct 2026 19:36:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac5b02e.fe639fcc.32b100.000f.GAE@google.com> Subject: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in mesh_send_sync 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: 3b7cab693ba2 Merge tag 'block-7.3-20261002' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16041bf5580000 kernel config: https://syzkaller.appspot.com/x/.config?x=fc812281b37d1115 dashboard link: https://syzkaller.appspot.com/bug?extid=f20755f37da70df33a16 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a71725580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3b7cab69.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c13a12e5eec3/vmlinux-3b7cab69.xz kernel image: https://storage.googleapis.com/syzbot-assets/69dc984f3177/bzImage-3b7cab69.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f20755f37da70df33a16@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in mesh_send_sync+0x3de/0x440 net/bluetooth/mgmt.c:2338 Read of size 1 at addr ffff88804e2ea83b by task kworker/u34:4/5875 CPU: 1 UID: 0 PID: 5875 Comm: kworker/u34:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: hci0 hci_cmd_sync_work 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 mesh_send_sync+0x3de/0x440 net/bluetooth/mgmt.c:2338 hci_cmd_sync_work+0x1b6/0x4c0 net/bluetooth/hci_sync.c:336 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 6185: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] mgmt_mesh_add+0x54/0x410 net/bluetooth/mgmt_util.c:413 mesh_send+0x2b4/0x770 net/bluetooth/mgmt.c:2531 hci_mgmt_cmd net/bluetooth/hci_sock.c:1730 [inline] hci_sock_sendmsg+0x1574/0x26a0 net/bluetooth/hci_sock.c:1850 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:815 [inline] __sys_sendto+0x48b/0x4e0 net/socket.c:2281 __do_sys_sendto net/socket.c:2288 [inline] __se_sys_sendto net/socket.c:2284 [inline] __ia32_sys_sendto+0xdd/0x1b0 net/socket.c:2284 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 5875: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kfree+0x22b/0x6d0 mm/slub.c:6802 mesh_send_complete net/bluetooth/mgmt.c:1090 [inline] mesh_send_start_complete+0x1a1/0x210 net/bluetooth/mgmt.c:2314 hci_cmd_sync_work+0x20a/0x4c0 net/bluetooth/hci_sync.c:338 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88804e2ea800 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 59 bytes inside of freed 96-byte region [ffff88804e2ea800, ffff88804e2ea860) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4e2ea flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff88801c042280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 144, tgid 144 (kworker/u33:5), ts 10148467167 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0x67c/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] lsm_blob_alloc+0x68/0x90 security/security.c:218 lsm_task_alloc security/security.c:270 [inline] security_task_alloc+0x2a/0x260 security/security.c:2785 copy_process+0x2c11/0x8380 kernel/fork.c:2293 kernel_clone+0x176/0x9d0 kernel/fork.c:2771 user_mode_thread+0xd1/0x120 kernel/fork.c:2848 call_usermodehelper_exec_work kernel/umh.c:169 [inline] call_usermodehelper_exec_work+0xcb/0x180 kernel/umh.c:155 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 page_owner free stack trace missing Memory state around the buggy address: ffff88804e2ea700: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88804e2ea780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88804e2ea800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88804e2ea880: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88804e2ea900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup