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c81d555a26
When unpairing the keys stored in hci_dev are removed. If SMP is ongoing the SMP context will also have references to these keys, so removing them from the hci_dev lists will make the pointers invalid. This can result in the following type of crashes: BUG: unable to handle kernel paging request at 6b6b6b6b IP: [<c11f26be>] __list_del_entry+0x44/0x71 *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC Modules linked in: hci_uart btqca btusb btintel btbcm btrtl hci_vhci rfcomm bluetooth_6lowpan bluetooth CPU: 0 PID: 723 Comm: kworker/u5:0 Not tainted 4.3.0-rc3+ #1379 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150318_183358- 04/01/2014 Workqueue: hci0 hci_rx_work [bluetooth] task: f19da940 ti: f1a94000 task.ti: f1a94000 EIP: 0060:[<c11f26be>] EFLAGS: 00010202 CPU: 0 EIP is at __list_del_entry+0x44/0x71 EAX: c0088d20 EBX: f30fcac0 ECX: 6b6b6b6b EDX: 6b6b6b6b ESI: f4b60000 EDI: c0088d20 EBP: f1a95d90 ESP: f1a95d8c DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 CR0: 8005003b CR2: 6b6b6b6b CR3: 319e5000 CR4: 00000690 Stack: f30fcac0 f1a95db0 f82dc3e1 f1bfc000 00000000 c106524f f1bfc000 f30fd020 f1a95dc0 f1a95dd0 f82dcbdb f1a95de0 f82dcbdb 00000067 f1bfc000 f30fd020 f1a95de0 f1a95df0 f82d1126 00000067 f82d1126 00000006 f30fd020 f1bfc000 Call Trace: [<f82dc3e1>] smp_chan_destroy+0x192/0x240 [bluetooth] [<c106524f>] ? trace_hardirqs_on_caller+0x14e/0x169 [<f82dcbdb>] smp_teardown_cb+0x47/0x64 [bluetooth] [<f82dcbdb>] ? smp_teardown_cb+0x47/0x64 [bluetooth] [<f82d1126>] l2cap_chan_del+0x5d/0x14d [bluetooth] [<f82d1126>] ? l2cap_chan_del+0x5d/0x14d [bluetooth] [<f82d40ef>] l2cap_conn_del+0x109/0x17b [bluetooth] [<f82d40ef>] ? l2cap_conn_del+0x109/0x17b [bluetooth] [<f82c0205>] ? hci_event_packet+0x5b1/0x2092 [bluetooth] [<f82d41aa>] l2cap_disconn_cfm+0x49/0x50 [bluetooth] [<f82d41aa>] ? l2cap_disconn_cfm+0x49/0x50 [bluetooth] [<f82c0228>] hci_event_packet+0x5d4/0x2092 [bluetooth] [<c1332c16>] ? skb_release_data+0x6a/0x95 [<f82ce5d4>] ? hci_send_to_monitor+0xe7/0xf4 [bluetooth] [<c1409708>] ? _raw_spin_unlock_irqrestore+0x44/0x57 [<f82b3bb0>] hci_rx_work+0xf1/0x28b [bluetooth] [<f82b3bb0>] ? hci_rx_work+0xf1/0x28b [bluetooth] [<c10635a0>] ? __lock_is_held+0x2e/0x44 [<c104772e>] process_one_work+0x232/0x432 [<c1071ddc>] ? rcu_read_lock_sched_held+0x50/0x5a [<c104772e>] ? process_one_work+0x232/0x432 [<c1047d48>] worker_thread+0x1b8/0x255 [<c1047b90>] ? rescuer_thread+0x23c/0x23c [<c104bb71>] kthread+0x91/0x96 [<c14096a7>] ? _raw_spin_unlock_irq+0x27/0x44 [<c1409d61>] ret_from_kernel_thread+0x21/0x30 [<c104bae0>] ? kthread_parkme+0x1e/0x1e To solve the issue, introduce a new smp_cancel_pairing() API that can be used to clean up the SMP state before touching the hci_dev lists. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> |
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| .. | ||
| 6lowpan | ||
| 9p | ||
| 802 | ||
| 8021q | ||
| appletalk | ||
| atm | ||
| ax25 | ||
| batman-adv | ||
| bluetooth | ||
| bridge | ||
| caif | ||
| can | ||
| ceph | ||
| core | ||
| dcb | ||
| dccp | ||
| decnet | ||
| dns_resolver | ||
| dsa | ||
| ethernet | ||
| hsr | ||
| ieee802154 | ||
| ipv4 | ||
| ipv6 | ||
| ipx | ||
| irda | ||
| iucv | ||
| key | ||
| l2tp | ||
| l3mdev | ||
| lapb | ||
| llc | ||
| mac80211 | ||
| mac802154 | ||
| mpls | ||
| netfilter | ||
| netlabel | ||
| netlink | ||
| netrom | ||
| nfc | ||
| openvswitch | ||
| packet | ||
| phonet | ||
| rds | ||
| rfkill | ||
| rose | ||
| rxrpc | ||
| sched | ||
| sctp | ||
| sunrpc | ||
| switchdev | ||
| tipc | ||
| unix | ||
| vmw_vsock | ||
| wimax | ||
| wireless | ||
| x25 | ||
| xfrm | ||
| compat.c | ||
| Kconfig | ||
| Makefile | ||
| socket.c | ||
| sysctl_net.c | ||