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android_kernel_xiaomi_sm8450/net/core
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suresh kumar d15c9f6e33 net-sysfs: add check for netdevice being present to speed_show 
[ Upstream commit 4224cfd7fb6523f7a9d1c8bb91bb5df1e38eb624 ]

When bringing down the netdevice or system shutdown, a panic can be
triggered while accessing the sysfs path because the device is already
removed.

    [  755.549084] mlx5_core 0000:12:00.1: Shutdown was called
    [  756.404455] mlx5_core 0000:12:00.0: Shutdown was called
    ...
    [  757.937260] BUG: unable to handle kernel NULL pointer dereference at           (null)
    [  758.031397] IP: [<ffffffff8ee11acb>] dma_pool_alloc+0x1ab/0x280

    crash> bt
    ...
    PID: 12649  TASK: ffff8924108f2100  CPU: 1   COMMAND: "amsd"
    ...
     #9 [ffff89240e1a38b0] page_fault at ffffffff8f38c778
        [exception RIP: dma_pool_alloc+0x1ab]
        RIP: ffffffff8ee11acb  RSP: ffff89240e1a3968  RFLAGS: 00010046
        RAX: 0000000000000246  RBX: ffff89243d874100  RCX: 0000000000001000
        RDX: 0000000000000000  RSI: 0000000000000246  RDI: ffff89243d874090
        RBP: ffff89240e1a39c0   R8: 000000000001f080   R9: ffff8905ffc03c00
        R10: ffffffffc04680d4  R11: ffffffff8edde9fd  R12: 00000000000080d0
        R13: ffff89243d874090  R14: ffff89243d874080  R15: 0000000000000000
        ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
    #10 [ffff89240e1a39c8] mlx5_alloc_cmd_msg at ffffffffc04680f3 [mlx5_core]
    #11 [ffff89240e1a3a18] cmd_exec at ffffffffc046ad62 [mlx5_core]
    #12 [ffff89240e1a3ab8] mlx5_cmd_exec at ffffffffc046b4fb [mlx5_core]
    #13 [ffff89240e1a3ae8] mlx5_core_access_reg at ffffffffc0475434 [mlx5_core]
    #14 [ffff89240e1a3b40] mlx5e_get_fec_caps at ffffffffc04a7348 [mlx5_core]
    #15 [ffff89240e1a3bb0] get_fec_supported_advertised at ffffffffc04992bf [mlx5_core]
    #16 [ffff89240e1a3c08] mlx5e_get_link_ksettings at ffffffffc049ab36 [mlx5_core]
    #17 [ffff89240e1a3ce8] __ethtool_get_link_ksettings at ffffffff8f25db46
    #18 [ffff89240e1a3d48] speed_show at ffffffff8f277208
    #19 [ffff89240e1a3dd8] dev_attr_show at ffffffff8f0b70e3
    #20 [ffff89240e1a3df8] sysfs_kf_seq_show at ffffffff8eedbedf
    #21 [ffff89240e1a3e18] kernfs_seq_show at ffffffff8eeda596
    #22 [ffff89240e1a3e28] seq_read at ffffffff8ee76d10
    #23 [ffff89240e1a3e98] kernfs_fop_read at ffffffff8eedaef5
    #24 [ffff89240e1a3ed8] vfs_read at ffffffff8ee4e3ff
    #25 [ffff89240e1a3f08] sys_read at ffffffff8ee4f27f
    #26 [ffff89240e1a3f50] system_call_fastpath at ffffffff8f395f92

    crash> net_device.state ffff89443b0c0000
      state = 0x5  (__LINK_STATE_START| __LINK_STATE_NOCARRIER)

To prevent this scenario, we also make sure that the netdevice is present.

Signed-off-by: suresh kumar <suresh2514@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-03-16 14:16:00 +01:00
..
bpf_sk_storage.c
bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON
2020-09-25 13:58:01 -07:00
datagram.c
udp: fix skb_copy_and_csum_datagram with odd segment sizes
2021-02-17 11:02:28 +01:00
datagram.h
net/core: Allow the compiler to verify declaration and definition consistency
2019-03-27 13:49:44 -07:00
dev_addr_lists.c
net: core: add nested_level variable in net_device
2020-09-28 15:00:15 -07:00
dev_ioctl.c
net: fix dev_ifsioc_locked() race condition
2021-03-07 12:34:07 +01:00
dev.c
xdp: check prog type before updating BPF link
2022-01-27 10:54:30 +01:00
devlink.c
devlink: Remove misleading internal_flags from health reporter dump
2022-01-27 10:54:34 +01:00
drop_monitor.c
drop_monitor: fix data-race in dropmon_net_event / trace_napi_poll_hit
2022-02-23 12:01:02 +01:00
dst_cache.c
wireguard: device: reset peer src endpoint when netns exits
2021-12-08 09:03:22 +01:00
dst.c
net, bpf: Fix ip6ip6 crash with collect_md populated skbs
2021-03-30 14:32:05 +02:00
failover.c
failover: allow name change on IFF_UP slave interfaces
2019-04-10 22:12:26 -07:00
fib_notifier.c
net: fib_notifier: propagate extack down to the notifier block callback
2019-10-04 11:10:56 -07:00
fib_rules.c
ipv6: fix memory leak in fib6_rule_suppress
2021-12-08 09:03:21 +01:00
filter.c
bpf: Do not try bpf_msg_push_data with len 0
2022-03-02 11:42:48 +01:00
flow_dissector.c
flow_dissector: Fix out-of-bounds warnings
2021-09-18 13:40:22 +02:00
flow_offload.c
net: Fix offloading indirect devices dependency on qdisc order creation
2021-09-18 13:40:30 +02:00
gen_estimator.c
net_sched: gen_estimator: support large ewma log
2021-01-27 11:55:23 +01:00
gen_stats.c
docs: networking: convert gen_stats.txt to ReST
2020-04-28 14:39:46 -07:00
gro_cells.c
gro_cells: reduce number of synchronize_net() calls
2020-11-25 11:28:12 -08:00
hwbm.c
net: hwbm: Make the hwbm_pool lock a mutex
2019-06-09 19:40:10 -07:00
link_watch.c
net: linkwatch: fix failure to restore device state across suspend/resume
2021-08-18 08:59:13 +02:00
lwt_bpf.c
lwt_bpf: Replace preempt_disable() with migrate_disable()
2020-12-07 11:53:40 -08:00
lwtunnel.c
lwtunnel: Validate RTA_ENCAP_TYPE attribute length
2022-01-11 15:25:00 +01:00
Makefile
ethtool: move to its own directory
2019-12-12 17:07:05 -08:00
neighbour.c
net, neigh: clear whole pneigh_entry at alloc time
2021-12-14 11:32:43 +01:00
net_namespace.c
netns: add schedule point in ops_exit_list()
2022-01-27 10:54:33 +01:00
net-procfs.c
net-procfs: show net devices bound packet types
2022-02-01 17:25:44 +01:00
net-sysfs.c
net-sysfs: add check for netdevice being present to speed_show
2022-03-16 14:16:00 +01:00
net-sysfs.h
net-sysfs: add netdev_change_owner()
2020-02-26 20:07:25 -08:00
net-traces.c
page_pool: add tracepoints for page_pool with details need by XDP
2019-06-19 11:23:13 -04:00
netclassid_cgroup.c
cgroup, netclassid: remove double cond_resched
2020-04-21 15:44:30 -07:00
netevent.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
netpoll.c
net: Have netpoll bring-up DSA management interface
2020-11-18 11:04:11 -08:00
netprio_cgroup.c
netprio_cgroup: Fix unlimited memory leak of v2 cgroups
2020-05-09 20:59:21 -07:00
page_pool.c
mm: fix struct page layout on 32-bit systems
2021-05-19 10:13:17 +02:00
pktgen.c
pktgen: fix misuse of BUG_ON() in pktgen_thread_worker()
2021-03-07 12:34:09 +01:00
ptp_classifier.c
ptp: Add generic ptp v2 header parsing function
2020-08-19 16:07:49 -07:00
request_sock.c
tcp: add rcu protection around tp->fastopen_rsk
2019-10-13 10:13:08 -07:00
rtnetlink.c
net_sched: add __rcu annotation to netdev->qdisc
2022-02-23 12:01:02 +01:00
scm.c
fs: Add receive_fd() wrapper for __receive_fd()
2020-07-13 11:03:44 -07:00
secure_seq.c
crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h
2020-05-08 15:32:17 +10:00
skbuff.c
net: fix up skbs delta_truesize in UDP GRO frag_list
2022-03-08 19:09:32 +01:00
skmsg.c
bpf, sockmap: Do not ignore orig_len parameter
2022-03-08 19:09:32 +01:00
sock_diag.c
bpf, net: Rework cookie generator as per-cpu one
2020-09-30 11:50:35 -07:00
sock_map.c
bpf: Fix integer overflow in argument calculation for bpf_map_area_alloc
2021-12-17 10:14:41 +01:00
sock_reuseport.c
udp: Prevent reuseport_select_sock from reading uninitialized socks
2021-01-23 16:03:59 +01:00
sock.c
sock: fix /proc/net/sockstat underflow in sk_clone_lock()
2021-11-26 10:39:14 +01:00
stream.c
net: stream: don't purge sk_error_queue in sk_stream_kill_queues()
2021-11-18 14:04:08 +01:00
sysctl_net_core.c
bpf: Prevent increasing bpf_jit_limit above max
2021-11-18 14:03:42 +01:00
timestamping.c
net: Introduce a new MII time stamping interface.
2019-12-25 19:51:33 -08:00
tso.c
net: tso: add UDP segmentation support
2020-06-18 20:46:23 -07:00
utils.c
net: Fix skb->csum update in inet_proto_csum_replace16().
2020-01-24 20:54:30 +01:00
xdp.c
xdp: fix xdp_return_frame() kernel BUG throw for page_pool memory model
2021-04-14 08:42:09 +02:00