WARNING: at drivers/tty/tty_buffer.c:476 flush_to_ldisc+0x1de/0x1f0()

[Dave Jones]

Fuzz-testing fallout from post 3.7 tree as of commit 414a6750e59b0b687034764c464e9ddecac0f7a6

[ 2181.230579] ------------[ cut here ]------------
[ 2181.231277] WARNING: at drivers/tty/tty_buffer.c:476 flush_to_ldisc+0x1de/0x1f0()
[ 2181.232358] Hardware name: GA-MA78GM-S2H
[ 2181.232925] tty is NULL
[ 2181.233430] Modules linked in: l2tp_ppp l2tp_core fuse rfcomm binfmt_misc hidp bnep scsi_transport_iscsi ipt_ULOG nfnetlink rose ipx p8023 p8022 caif_socket caif af_rxrpc x25 irda af_key appletalk pppoe netrom pppox ppp_generic decnet phonet slhc psnap crc_ccitt ax25 llc2 rds atm llc nfc can nfsv3 nfs_acl nfs fscache lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_conntrack nf_conntrack ip6table_filter ip6_tables snd_hda_codec_realtek btusb snd_hda_intel bluetooth usb_debug snd_hda_codec microcode snd_pcm serio_raw pcspkr snd_page_alloc snd_timer edac_core snd soundcore r8169 mii vhost_net tun macvtap macvlan kvm_amd kvm
[ 2181.245632] Pid: 29787, comm: kworker/0:1 Not tainted 3.7.0+ #12
[ 2181.246503] Call Trace:
[ 2181.246851]  [<ffffffff8104da4f>] warn_slowpath_common+0x7f/0xc0
[ 2181.247725]  [<ffffffff8104db46>] warn_slowpath_fmt+0x46/0x50
[ 2181.248558]  [<ffffffff8132e6ba>] ? ___ratelimit+0x9a/0x120
[ 2181.249347]  [<ffffffff813e897e>] flush_to_ldisc+0x1de/0x1f0
[ 2181.250164]  [<ffffffff81071237>] process_one_work+0x207/0x750
[ 2181.251013]  [<ffffffff810711c7>] ? process_one_work+0x197/0x750
[ 2181.251893]  [<ffffffff8106de50>] ? destroy_work_on_stack+0x20/0x20
[ 2181.252809]  [<ffffffff813e87a0>] ? tty_insert_flip_string_fixed_flag+0x110/0x110
[ 2181.253993]  [<ffffffff81071b56>] worker_thread+0x156/0x440
[ 2181.254815]  [<ffffffff81071a00>] ? rescuer_thread+0x240/0x240
[ 2181.255638]  [<ffffffff810784bd>] kthread+0xed/0x100
[ 2181.256374]  [<ffffffff810b80ce>] ? put_lock_stats.isra.23+0xe/0x40
[ 2181.257290]  [<ffffffff810783d0>] ? kthread_create_on_node+0x160/0x160
[ 2181.258223]  [<ffffffff816a8ddc>] ret_from_fork+0x7c/0xb0
[ 2181.259018]  [<ffffffff810783d0>] ? kthread_create_on_node+0x160/0x160
[ 2181.259969] ---[ end trace 12dd9f01acd7e09f ]---

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