Alexander Lobakin 9a5a90d167 net: core: netif_receive_skb_list: unlist skb before passing to pt->func ... __netif_receive_skb_list_ptype() leaves skb->next poisoned before passing it to pt_prev->func handler, what may produce (in certain cases, e.g. DSA setup) crashes like: [ 88.606777] CPU 0 Unable to handle kernel paging request at virtual address 0000000e, epc == 80687078, ra == 8052cc7c [ 88.618666] Oops[#1]: [ 88.621196] CPU: 0 PID: 0 Comm: swapper Not tainted 5.1.0-rc2-dlink-00206-g4192a172-dirty #1473 [ 88.630885] $ 0 : 00000000 10000400 00000002 864d7850 [ 88.636709] $ 4 : 87c0ddf0 864d7800 87c0ddf0 00000000 [ 88.642526] $ 8 : 00000000 49600000 00000001 00000001 [ 88.648342] $12 : 00000000 c288617b dadbee27 25d17c41 [ 88.654159] $16 : 87c0ddf0 85cff080 80790000 fffffffd [ 88.659975] $20 : 80797b20 ffffffff 00000001 864d7800 [ 88.665793] $24 : 00000000 8011e658 [ 88.671609] $28 : 80790000 87c0dbc0 87cabf00 8052cc7c [ 88.677427] Hi : 00000003 [ 88.680622] Lo : 7b5b4220 [ 88.683840] epc : 80687078 vlan_dev_hard_start_xmit+0x1c/0x1a0 [ 88.690532] ra : 8052cc7c dev_hard_start_xmit+0xac/0x188 [ 88.696734] Status: 10000404 IEp [ 88.700422] Cause : 50000008 (ExcCode 02) [ 88.704874] BadVA : 0000000e [ 88.708069] PrId : 0001a120 (MIPS interAptiv (multi)) [ 88.713005] Modules linked in: [ 88.716407] Process swapper (pid: 0, threadinfo=(ptrval), task=(ptrval), tls=00000000) [ 88.725219] Stack : 85f61c28 00000000 0000000e 80780000 87c0ddf0 85cff080 80790000 8052cc7c [ 88.734529] 87cabf00 00000000 00000001 85f5fb40 807b0000 864d7850 87cabf00 807d0000 [ 88.743839] 864d7800 8655f600 00000000 85cff080 87c1c000 0000006a 00000000 8052d96c [ 88.753149] 807a0000 8057adb8 87c0dcc8 87c0dc50 85cfff08 00000558 87cabf00 85f58c50 [ 88.762460] 00000002 85f58c00 864d7800 80543308 fffffff4 00000001 85f58c00 864d7800 [ 88.771770] ... [ 88.774483] Call Trace: [ 88.777199] [<80687078>] vlan_dev_hard_start_xmit+0x1c/0x1a0 [ 88.783504] [<8052cc7c>] dev_hard_start_xmit+0xac/0x188 [ 88.789326] [<8052d96c>] __dev_queue_xmit+0x6e8/0x7d4 [ 88.794955] [<805a8640>] ip_finish_output2+0x238/0x4d0 [ 88.800677] [<805ab6a0>] ip_output+0xc8/0x140 [ 88.805526] [<805a68f4>] ip_forward+0x364/0x560 [ 88.810567] [<805a4ff8>] ip_rcv+0x48/0xe4 [ 88.815030] [<80528d44>] __netif_receive_skb_one_core+0x44/0x58 [ 88.821635] [<8067f220>] dsa_switch_rcv+0x108/0x1ac [ 88.827067] [<80528f80>] __netif_receive_skb_list_core+0x228/0x26c [ 88.833951] [<8052ed84>] netif_receive_skb_list+0x1d4/0x394 [ 88.840160] [<80355a88>] lunar_rx_poll+0x38c/0x828 [ 88.845496] [<8052fa78>] net_rx_action+0x14c/0x3cc [ 88.850835] [<806ad300>] __do_softirq+0x178/0x338 [ 88.856077] [<8012a2d4>] irq_exit+0xbc/0x100 [ 88.860846] [<802f8b70>] plat_irq_dispatch+0xc0/0x144 [ 88.866477] [<80105974>] handle_int+0x14c/0x158 [ 88.871516] [<806acfb0>] r4k_wait+0x30/0x40 [ 88.876462] Code: afb10014 8c8200a0 00803025 <9443000c> 94a20468 00000000 10620042 00a08025 9605046a [ 88.887332] [ 88.888982] ---[ end trace eb863d007da11cf1 ]--- [ 88.894122] Kernel panic - not syncing: Fatal exception in interrupt [ 88.901202] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- Fix this by pulling skb off the sublist and zeroing skb->next pointer before calling ptype callback. Fixes: 88eb1944e1 ("net: core: propagate SKB lists through packet_type lookup") Reviewed-by: Edward Cree <ecree@solarflare.com> Signed-off-by: Alexander Lobakin <alobakin@dlink.ru> Signed-off-by: David S. Miller <davem@davemloft.net>		2019-03-28 17:28:05 -07:00
..
datagram.c	net: datagram: fix unbounded loop in __skb_try_recv_datagram()	2019-03-27 21:58:53 -07:00
dev.c	net: core: netif_receive_skb_list: unlist skb before passing to pt->func	2019-03-28 17:28:05 -07:00
dev_addr_lists.c	net: dev: Issue NETDEV_PRE_CHANGEADDR	2018-12-13 18:41:38 -08:00
dev_ioctl.c	net: dev: Add extack argument to dev_set_mac_address()	2018-12-13 18:41:38 -08:00
devlink.c	net: devlink: skip info_get op call if it is not defined in dumpit	2019-03-26 11:25:29 -07:00
drop_monitor.c
dst.c	net: add a route cache full diagnostic message	2019-01-17 15:37:25 -08:00
dst_cache.c
ethtool.c	ethtool: reduce stack usage with clang	2019-03-07 09:45:21 -08:00
failover.c	net: Introduce generic failover module	2018-05-28 22:59:54 -04:00
fib_notifier.c
fib_rules.c	net/fib_rules: Update fib_nl_dumprule for strict data checking	2018-10-08 10:39:05 -07:00
filter.c	bpf: Add bpf_get_listener_sock(struct bpf_sock *sk) helper	2019-03-13 12:04:35 -07:00
flow_dissector.c	net/flow_dissector: move bpf case into __skb_flow_bpf_dissect	2019-01-29 01:08:29 +01:00
flow_offload.c	flow_offload: add flow action infrastructure	2019-02-06 10:38:25 -08:00
gen_estimator.c	net: core: protect rate estimator statistics pointer with lock	2018-08-11 12:37:10 -07:00
gen_stats.c	net: sched: put back q.qlen into a single location	2019-03-02 14:10:18 -08:00
gro_cells.c	gro_cells: make sure device is up in gro_cells_receive()	2019-03-10 11:07:14 -07:00
hwbm.c
link_watch.c	net: linkwatch: add check for netdevice being present to linkwatch_do_dev	2018-09-19 21:06:46 -07:00
lwt_bpf.c	net: fix GSO in bpf_lwt_push_ip_encap	2019-03-07 10:41:29 +01:00
lwtunnel.c	ip_tunnel: Add dst_cache support in lwtunnel_state of ip tunnel	2019-02-24 22:13:49 -08:00
Makefile	flow_offload: add flow_rule and flow_match structures and use them	2019-02-06 10:38:25 -08:00
neighbour.c	neigh: hook tracepoints in neigh update code	2019-02-17 10:33:39 -08:00
net-procfs.c
net-sysfs.c	net-sysfs: Fix memory leak in netdev_register_kobject	2019-03-21 13:38:27 -07:00
net-sysfs.h
net-traces.c	trace: events: add a few neigh tracepoints	2019-02-17 10:33:39 -08:00
net_namespace.c	netns: provide pure entropy for net_hash_mix()	2019-03-28 17:00:45 -07:00
netclassid_cgroup.c	cgroup, netclassid: add a preemption point to write_classid	2018-10-23 12:58:17 -07:00
netevent.c
netpoll.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2018-12-27 13:04:52 -08:00
netprio_cgroup.c
page_pool.c	page_pool: use DMA_ATTR_SKIP_CPU_SYNC for DMA mappings	2019-02-13 22:00:16 -08:00
pktgen.c	mm: replace all open encodings for NUMA_NO_NODE	2019-03-05 21:07:14 -08:00
ptp_classifier.c
request_sock.c
rtnetlink.c	net: Get rid of SWITCHDEV_ATTR_ID_PORT_PARENT_ID	2019-02-06 14:17:03 -08:00
scm.c	socket: Add SO_TIMESTAMPING_NEW	2019-02-03 11:17:31 -08:00
secure_seq.c	infiniband: i40iw, nes: don't use wall time for TCP sequence numbers	2018-07-11 12:10:19 -06:00
skbuff.c	net: Do not allocate page fragments that are not skb aligned	2019-02-17 15:48:43 -08:00
skmsg.c	bpf: Stop the psock parser before canceling its work	2019-03-07 15:16:20 +01:00
sock.c	net: support 64bit rates for getsockopt(SO_MAX_PACING_RATE)	2019-03-01 23:08:30 -08:00
sock_diag.c	net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd()	2018-08-14 10:01:24 -07:00
sock_map.c	bpf: skmsg, fix psock create on existing kcm/tls port	2018-10-20 00:40:45 +02:00
sock_reuseport.c	sctp: add sock_reuseport for the sock in __sctp_hash_endpoint	2018-11-12 09:09:51 -08:00
stream.c	tcp: reduce POLLOUT events caused by TCP_NOTSENT_LOWAT	2018-12-04 21:21:18 -08:00
sysctl_net_core.c	net: introduce a knob to control whether to inherit devconf config	2019-01-22 11:07:21 -08:00
timestamping.c
tso.c
utils.c	net: Remove some unneeded semicolon	2018-08-04 13:05:39 -07:00
xdp.c	xdp: remove redundant variable 'headroom'	2018-09-01 01:35:53 +02:00