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Ilya Dryomov 7563d6f2be libceph: validate con->state at the top of try_write() 
commit 9c55ad1c21 upstream.

ceph_con_workfn() validates con->state before calling try_read() and
then try_write().  However, try_read() temporarily releases con->mutex,
notably in process_message() and ceph_con_in_msg_alloc(), opening the
window for ceph_con_close() to sneak in, close the connection and
release con->sock.  When try_write() is called on the assumption that
con->state is still valid (i.e. not STANDBY or CLOSED), a NULL sock
gets passed to the networking stack:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
  IP: selinux_socket_sendmsg+0x5/0x20

Make sure con->state is valid at the top of try_write() and add an
explicit BUG_ON for this, similar to try_read().

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/23706
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jason Dillaman <dillaman@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2018-05-01 12:58:23 -07:00
..
6lowpan License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
9p 9p/trans_virtio: discard zero-length reply 2018-02-22 15:42:30 +01:00
802 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
8021q vlan: also check phy_driver ts_info for vlan's real device 2018-04-12 12:32:24 +02:00
appletalk License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
atm License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ax25 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-08-09 16:28:45 -07:00
bluetooth Bluetooth: Fix connection if directed advertising and privacy is used 2018-04-19 08:56:19 +02:00
bpf bpf: Align packet data properly in program testing framework. 2017-05-02 11:46:28 -04:00
bridge netfilter: compat: prepare xt_compat_init_offsets to return errors 2018-04-26 11:02:21 +02:00
caif License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
can can: af_can: canfd_rcv(): replace WARN_ONCE by pr_warn_once 2018-01-23 19:58:17 +01:00
ceph libceph: validate con->state at the top of try_write() 2018-05-01 12:58:23 -07:00
core vlan: Fix reading memory beyond skb->tail in skb_vlan_tagged_multi 2018-04-29 11:33:12 +02:00
dcb rtnetlink: make rtnl_register accept a flags parameter 2017-08-09 16:57:38 -07:00
dccp dccp: check sk for closed state in dccp_sendmsg() 2018-03-31 18:10:40 +02:00
decnet dn_getsockoptdecnet: move nf_{get/set}sockopt outside sock lock 2018-02-25 11:07:52 +01:00
dns_resolver KEYS: DNS: limit the length of option strings 2018-04-29 11:33:10 +02:00
dsa net: dsa: Discard frames from unused ports 2018-04-24 09:36:39 +02:00
ethernet networking: make skb_push & __skb_push return void pointers 2017-06-16 11:48:40 -04:00
hsr net/hsr: Check skb_put_padto() return value 2017-08-22 13:40:23 -07:00
ieee802154 ieee802154: 6lowpan: fix possible NULL deref in lowpan_device_event() 2018-03-31 18:10:40 +02:00
ife net: sched: ife: check on metadata length 2018-04-29 11:33:13 +02:00
ipv4 tcp: clear tp->packets_out when purging write queue 2018-04-29 11:33:13 +02:00
ipv6 ipv6: sr: fix NULL pointer dereference in seg6_do_srh_encap()- v4 pkts 2018-04-29 11:33:10 +02:00
ipx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
iucv net/iucv: Free memory obtained by kzalloc 2018-03-31 18:10:41 +02:00
kcm kcm: lock lower socket in kcm_attach 2018-03-31 18:10:40 +02:00
key af_key: fix buffer overread in parse_exthdrs() 2018-01-23 19:58:12 +01:00
l2tp l2tp: check sockaddr length in pppol2tp_connect() 2018-04-29 11:33:11 +02:00
l3mdev
…
lapb net, lapb: convert lapb_cb.refcnt from atomic_t to refcount_t 2017-07-04 22:35:16 +01:00
llc llc: fix NULL pointer deref for SOCK_ZAPPED 2018-04-29 11:33:13 +02:00
mac80211 mac80211: Fix setting TX power on monitor interfaces 2018-04-12 12:32:15 +02:00
mac802154 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mpls mpls, nospec: Sanitize array index in mpls_label_ok() 2018-02-22 15:42:28 +01:00
ncsi net/ncsi: Fix length of GVI response packet 2017-10-21 01:56:38 +01:00
netfilter netfilter: x_tables: limit allocation requests for blob rule heads 2018-04-26 11:02:21 +02:00
netlabel License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
netlink netlink: make sure nladdr has correct size in netlink_connect() 2018-04-12 12:32:23 +02:00
netrom net, netrom: convert nr_node.refcount from atomic_t to refcount_t 2017-07-04 22:35:17 +01:00
nfc NFC: fix device-allocation error return 2017-11-30 08:40:55 +00:00
nsh nsh: add GSO support 2017-08-29 15:16:52 -07:00
openvswitch openvswitch: Remove padding from packet before L3+ conntrack processing 2018-04-26 11:02:15 +02:00
packet packet: fix bitfield update race 2018-04-29 11:33:12 +02:00
phonet License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
psample MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
qrtr qrtr: Move to postcore_initcall 2017-11-08 14:32:18 +09:00
rds RDS: IB: Fix null pointer issue 2018-04-26 11:02:17 +02:00
rfkill net: rfkill: gpio: Switch to devm_acpi_dev_add_driver_gpios() 2017-06-13 11:07:51 +02:00
rose
…
rxrpc rxrpc: Don't put crypto buffers on the stack 2018-04-26 11:02:19 +02:00
sched net: sched: ife: handle malformed tlv length 2018-04-29 11:33:13 +02:00
sctp sctp: do not check port in sctp_inet6_cmp_addr 2018-04-29 11:33:12 +02:00
smc net/smc: fix shutdown in state SMC_LISTEN 2018-04-29 11:33:11 +02:00
strparser strparser: Fix incorrect strp->need_bytes value. 2018-04-29 11:33:13 +02:00
sunrpc SUNRPC: Don't call __UDPX_INC_STATS() from a preemptible context 2018-04-26 11:02:19 +02:00
switchdev net: switchdev: Remove bridge bypass support from switchdev 2017-08-07 14:48:48 -07:00
tipc tipc: add policy for TIPC_NLA_NET_ADDR 2018-04-29 11:33:12 +02:00
tls tls: reset crypto_info when do_tls_setsockopt_tx fails 2018-01-31 14:03:48 +01:00
unix License cleanup: add SPDX license identifiers to some files 2017-11-02 10:04:46 -07:00
vmw_vsock VSOCK: fix outdated sk_state value in hvs_release() 2018-02-25 11:07:59 +01:00
wimax License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wireless nl80211: Check for the required netlink attribute presence 2018-03-03 10:24:34 +01:00
x25 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm xfrm: Refuse to insert 32 bit userspace socket policies on 64 bit systems 2018-04-08 14:26:29 +02:00
Kconfig net: Remove CONFIG_NETFILTER_DEBUG and _ASSERT() macros. 2017-09-04 13:25:20 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat.c net: compat: assert the size of cmsg copied in is as expected 2017-09-20 15:36:18 -07:00
socket.c kmemcheck: remove annotations 2018-02-22 15:42:23 +01:00
sysctl_net.c
…