Hello, syzbot found the following issue on: HEAD commit: bcf87687 Linux 5.8 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=107dbe0a900000 kernel config: https://syzkaller.appspot.com/x/.config?x=4b489d75d0c8859d dashboard link: https://syzkaller.appspot.com/bug?extid=a9b58a6aa2a3e1d37f87 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=145f6342900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a9b58a6aa2a3e1d37f87@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x5e1/0x800 kernel/locking/spinlock_debug.c:112 Read of size 4 at addr ffff8880a74d4e8c by task syz-executor.5/18383 CPU: 1 PID: 18383 Comm: syz-executor.5 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] do_raw_spin_lock+0x5e1/0x800 kernel/locking/spinlock_debug.c:112 spin_lock include/linux/spinlock.h:353 [inline] sco_chan_del net/bluetooth/sco.c:142 [inline] __sco_sock_close+0x408/0xed0 net/bluetooth/sco.c:433 sco_sock_close net/bluetooth/sco.c:447 [inline] sco_sock_release+0x63/0x4f0 net/bluetooth/sco.c:1021 __sock_release net/socket.c:605 [inline] sock_close+0xd8/0x260 net/socket.c:1278 __fput+0x2f0/0x750 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:135 get_signal+0x15ab/0x1d30 kernel/signal.c:2547 do_signal+0x33/0x610 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0xd7/0x1e0 arch/x86/entry/common.c:269 do_syscall_64+0x7f/0xe0 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cce9 Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff2665afc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 0000000000002140 RCX: 000000000045cce9 RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000006 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffdf046a56f R14: 00007ff2665b09c0 R15: 000000000078bf0c Allocated by task 18383: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] sco_conn_add net/bluetooth/sco.c:112 [inline] sco_connect net/bluetooth/sco.c:247 [inline] sco_sock_connect+0x3c6/0xaa0 net/bluetooth/sco.c:576 __sys_connect_file net/socket.c:1854 [inline] __sys_connect+0x2da/0x360 net/socket.c:1871 __do_sys_connect net/socket.c:1882 [inline] __se_sys_connect net/socket.c:1879 [inline] __x64_sys_connect+0x76/0x80 net/socket.c:1879 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 8113: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 sco_connect_cfm+0x96/0x7e0 net/bluetooth/sco.c:1136 hci_connect_cfm include/net/bluetooth/hci_core.h:1340 [inline] hci_sco_setup+0xf0/0x3e0 net/bluetooth/hci_conn.c:399 hci_conn_complete_evt net/bluetooth/hci_event.c:2641 [inline] hci_event_packet+0x1258e/0x18260 net/bluetooth/hci_event.c:6033 hci_rx_work+0x236/0x9c0 net/bluetooth/hci_core.c:4705 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff8880a74d4e80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 12 bytes inside of 96-byte region [ffff8880a74d4e80, ffff8880a74d4ee0) The buggy address belongs to the page: page:ffffea00029d3500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00023cae88 ffffea000288c588 ffff8880aa400540 raw: 0000000000000000 ffff8880a74d4000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a74d4d80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880a74d4e00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff8880a74d4e80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8880a74d4f00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff8880a74d4f80: 00 00 00 00 00 00 00 00 00 00 00 00 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
