Hi Archie, > Currently l2cap_chan_set_defaults() reset chan->conf_state to zero. > However, there is a flag CONF_NOT_COMPLETE which is set when > creating the l2cap_chan. It is suggested that the flag should be > cleared when l2cap_chan is ready, but when l2cap_chan_set_defaults() > is called, l2cap_chan is not yet ready. Therefore, we must set this > flag as the default. > > Example crash call trace: > __dump_stack lib/dump_stack.c:15 [inline] > dump_stack+0xc4/0x118 lib/dump_stack.c:56 > panic+0x1c6/0x38b kernel/panic.c:117 > __warn+0x170/0x1b9 kernel/panic.c:471 > warn_slowpath_fmt+0xc7/0xf8 kernel/panic.c:494 > debug_print_object+0x175/0x193 lib/debugobjects.c:260 > debug_object_assert_init+0x171/0x1bf lib/debugobjects.c:614 > debug_timer_assert_init kernel/time/timer.c:629 [inline] > debug_assert_init kernel/time/timer.c:677 [inline] > del_timer+0x7c/0x179 kernel/time/timer.c:1034 > try_to_grab_pending+0x81/0x2e5 kernel/workqueue.c:1230 > cancel_delayed_work+0x7c/0x1c4 kernel/workqueue.c:2929 > l2cap_clear_timer+0x1e/0x41 include/net/bluetooth/l2cap.h:834 > l2cap_chan_del+0x2d8/0x37e net/bluetooth/l2cap_core.c:640 > l2cap_chan_close+0x532/0x5d8 net/bluetooth/l2cap_core.c:756 > l2cap_sock_shutdown+0x806/0x969 net/bluetooth/l2cap_sock.c:1174 > l2cap_sock_release+0x64/0x14d net/bluetooth/l2cap_sock.c:1217 > __sock_release+0xda/0x217 net/socket.c:580 > sock_close+0x1b/0x1f net/socket.c:1039 > __fput+0x322/0x55c fs/file_table.c:208 > ____fput+0x17/0x19 fs/file_table.c:244 > task_work_run+0x19b/0x1d3 kernel/task_work.c:115 > exit_task_work include/linux/task_work.h:21 [inline] > do_exit+0xe4c/0x204a kernel/exit.c:766 > do_group_exit+0x291/0x291 kernel/exit.c:891 > get_signal+0x749/0x1093 kernel/signal.c:2396 > do_signal+0xa5/0xcdb arch/x86/kernel/signal.c:737 > exit_to_usermode_loop arch/x86/entry/common.c:243 [inline] > prepare_exit_to_usermode+0xed/0x235 arch/x86/entry/common.c:277 > syscall_return_slowpath+0x3a7/0x3b3 arch/x86/entry/common.c:348 > int_ret_from_sys_call+0x25/0xa3 > > Signed-off-by: Archie Pusaka <apusaka@xxxxxxxxxxxx> > Reported-by: syzbot+338f014a98367a08a114@xxxxxxxxxxxxxxxxxxxxxxxxx > Reviewed-by: Alain Michaud <alainm@xxxxxxxxxxxx> > Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@xxxxxxxxxxxx> > Reviewed-by: Guenter Roeck <groeck@xxxxxxxxxxxx> > --- > > net/bluetooth/l2cap_core.c | 2 ++ > 1 file changed, 2 insertions(+) patch has been applied to bluetooth-next tree. Regards Marcel
