Duoming Zhou 46ad629e58 ax25: Fix NULL pointer dereference in ax25_kill_by_device ... [ Upstream commit 71171ac8eb ] When two ax25 devices attempted to establish connection, the requester use ax25_create(), ax25_bind() and ax25_connect() to initiate connection. The receiver use ax25_rcv() to accept connection and use ax25_create_cb() in ax25_rcv() to create ax25_cb, but the ax25_cb->sk is NULL. When the receiver is detaching, a NULL pointer dereference bug caused by sock_hold(sk) in ax25_kill_by_device() will happen. The corresponding fail log is shown below: =============================================================== BUG: KASAN: null-ptr-deref in ax25_device_event+0xfd/0x290 Call Trace: ... ax25_device_event+0xfd/0x290 raw_notifier_call_chain+0x5e/0x70 dev_close_many+0x174/0x220 unregister_netdevice_many+0x1f7/0xa60 unregister_netdevice_queue+0x12f/0x170 unregister_netdev+0x13/0x20 mkiss_close+0xcd/0x140 tty_ldisc_release+0xc0/0x220 tty_release_struct+0x17/0xa0 tty_release+0x62d/0x670 ... This patch add condition check in ax25_kill_by_device(). If s->sk is NULL, it will goto if branch to kill device. Fixes: 4e0f718daf ("ax25: improve the incomplete fix to avoid UAF and NPD bugs") Reported-by: Thomas Osterried <thomas@osterried.de> Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-03-16 14:23:38 +01:00
..
6lowpan	6lowpan: iphc: Fix an off-by-one check of array index	2021-07-22 16:19:03 +02:00
9p	xen/9p: use alloc/free_pages_exact()	2022-03-11 12:22:36 +01:00
802	net: 802: remove dead leftover after ipx driver removal	2021-08-13 16:30:35 -07:00
8021q	net: vlan: fix underflow for the real_dev refcnt	2021-12-01 09:04:53 +01:00
appletalk	net: socket: rework compat_ifreq_ioctl()	2021-07-23 14:20:25 +01:00
atm
ax25	ax25: Fix NULL pointer dereference in ax25_kill_by_device	2022-03-16 14:23:38 +01:00
batman-adv	batman-adv: Don't expect inter-netns unique iflink indices	2022-03-08 19:12:45 +01:00
bluetooth	Bluetooth: refactor malicious adv data check	2022-02-01 17:27:14 +01:00
bpf	bpf, test, cgroup: Use sk_{alloc,free} for test cases	2021-09-28 09:29:28 +02:00
bpfilter
bridge	net: bridge: multicast: notify switchdev driver whenever MC processing gets disabled	2022-02-23 12:03:13 +01:00
caif	net-caif: avoid user-triggerable WARN_ON(1)	2021-09-14 12:51:15 +01:00
can	net-timestamp: convert sk->sk_tskey to atomic_t	2022-03-02 11:48:01 +01:00
ceph	Networking changes for 5.14.	2021-06-30 15:51:09 -07:00
core	net: fix up skbs delta_truesize in UDP GRO frag_list	2022-03-08 19:12:44 +01:00
dcb	net: dcb: disable softirqs in dcbnl_flush_dev()	2022-03-08 19:12:52 +01:00
dccp	tcp: switch orphan_count to bare per-cpu counters	2021-11-18 19:16:33 +01:00
decnet	net: Remove redundant if statements	2021-08-05 13:27:50 +01:00
dns_resolver
dsa	net: dsa: lan9303: handle hwaccel VLAN tags	2022-02-23 12:03:11 +01:00
ethernet	move netdev_boot_setup into Space.c	2021-08-03 13:05:26 +01:00
ethtool	ethtool: do not perform operations on net devices being unregistered	2021-12-14 10:57:09 +01:00
hsr
ieee802154	net: ieee802154: Return meaningful error codes from the netlink helpers	2022-02-08 18:34:09 +01:00
ife
ipv4	esp: Fix BEET mode inter address family tunneling on GSO	2022-03-16 14:23:36 +01:00
ipv6	esp: Fix BEET mode inter address family tunneling on GSO	2022-03-16 14:23:36 +01:00
iucv	net/iucv: Replace deprecated CPU-hotplug functions.	2021-08-09 10:13:32 +01:00
kcm	net: sock: introduce sk_error_report	2021-06-29 11:28:21 -07:00
key
l2tp	net/l2tp: Fix reference count leak in l2tp_udp_recv_core	2021-09-09 11:00:20 +01:00
l3mdev
lapb
llc	net: Remove redundant if statements	2021-08-05 13:27:50 +01:00
mac80211	mac80211: treat some SAE auth steps as final	2022-03-08 19:12:46 +01:00
mac802154	ieee802154: Remove redundant initialization of variable ret	2021-09-07 14:06:08 +01:00
mctp	mctp: Don't let RTM_DELROUTE delete local routes	2021-12-08 09:04:53 +01:00
mpls	net: mpls: Fix notifications when deleting a device	2021-12-08 09:04:47 +01:00
mptcp	mptcp: Correctly set DATA_FIN timeout when number of retransmits is large	2022-03-08 19:12:48 +01:00
ncsi	net/ncsi: check for error return from call to nla_put_u32	2022-01-05 12:42:37 +01:00
netfilter	netfilter: nf_tables: prefer kfree_rcu(ptr, rcu) variant	2022-03-08 19:12:49 +01:00
netlabel	net: fix NULL pointer reference in cipso_v4_doi_free	2021-08-30 12:23:18 +01:00
netlink	net: netlink: af_netlink: Prevent empty skb by adding a check on len.	2021-12-17 10:30:15 +01:00
netrom	netrom: fix api breakage in nr_setsockopt()	2022-01-27 11:04:00 +01:00
nfc	nfc: llcp: fix NULL error pointer dereference on sendmsg() after failed bind()	2022-01-27 11:02:48 +01:00
nsh
openvswitch	openvswitch: Fix setting ipv6 fields causing hw csum failure	2022-03-02 11:47:57 +01:00
packet	af_packet: fix data-race in packet_setsockopt / packet_setsockopt	2022-02-05 12:38:59 +01:00
phonet	phonet: refcount leak in pep_sock_accep	2022-01-11 15:35:16 +01:00
psample
qrtr	net: qrtr: revert check in qrtr_endpoint_post()	2021-09-02 11:37:02 +01:00
rds	rds: memory leak in __rds_conn_create()	2021-12-22 09:32:42 +01:00
rfkill
rose
rxrpc	rxrpc: Adjust retransmission backoff	2022-02-01 17:27:11 +01:00
sched	net/sched: act_ct: Fix flow table lookup after ct clear or switching zones	2022-03-02 11:47:57 +01:00
sctp	sctp: hold endpoint before calling cb in sctp_transport_lookup_process	2022-01-11 15:35:14 +01:00
smc	net/smc: fix unexpected SMC_CLC_DECL_ERR_REGRMB error cause by server	2022-03-08 19:12:45 +01:00
strparser	bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding	2021-11-18 19:17:11 +01:00
sunrpc	SUNRPC: Fix sockaddr handling in the svc_xprt_create_error trace point	2022-03-08 19:12:37 +01:00
switchdev	net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge	2021-08-04 12:35:07 +01:00
tipc	tipc: fix incorrect order of state message data sanity check	2022-03-16 14:23:38 +01:00
tls	net/tls: Fix authentication failure in CCM mode	2021-12-08 09:04:41 +01:00
unix	af_unix: annote lockless accesses to unix_tot_inflight & gc_in_progress	2022-01-27 11:05:30 +01:00
vmw_vsock	vsock: remove vsock from connected table when connect is interrupted by a signal	2022-02-23 12:03:09 +01:00
wireless	nl80211: Handle nla_memdup failures in handle_nan_filter	2022-03-08 19:12:52 +01:00
x25
xdp	Revert "xsk: Do not sleep in poll() when need_wakeup set"	2021-12-22 09:32:51 +01:00
xfrm	Revert "xfrm: xfrm_state_mtu should return at least 1280 for ipv6"	2022-03-08 19:12:54 +01:00
compat.c
devres.c
Kconfig	mctp: Add MCTP base	2021-07-29 15:06:49 +01:00
Makefile	mctp: Add MCTP base	2021-07-29 15:06:49 +01:00
socket.c	net: fix SOF_TIMESTAMPING_BIND_PHC to work with multiple sockets	2022-01-27 11:03:52 +01:00
sysctl_net.c