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Ziyang Xuan 563bcbae3b net: vlan: fix a UAF in vlan_dev_real_dev() 
The real_dev of a vlan net_device may be freed after
unregister_vlan_dev(). Access the real_dev continually by
vlan_dev_real_dev() will trigger the UAF problem for the
real_dev like following:

==================================================================
BUG: KASAN: use-after-free in vlan_dev_real_dev+0xf9/0x120
Call Trace:
 kasan_report.cold+0x83/0xdf
 vlan_dev_real_dev+0xf9/0x120
 is_eth_port_of_netdev_filter.part.0+0xb1/0x2c0
 is_eth_port_of_netdev_filter+0x28/0x40
 ib_enum_roce_netdev+0x1a3/0x300
 ib_enum_all_roce_netdevs+0xc7/0x140
 netdevice_event_work_handler+0x9d/0x210
...

Freed by task 9288:
 kasan_save_stack+0x1b/0x40
 kasan_set_track+0x1c/0x30
 kasan_set_free_info+0x20/0x30
 __kasan_slab_free+0xfc/0x130
 slab_free_freelist_hook+0xdd/0x240
 kfree+0xe4/0x690
 kvfree+0x42/0x50
 device_release+0x9f/0x240
 kobject_put+0x1c8/0x530
 put_device+0x1b/0x30
 free_netdev+0x370/0x540
 ppp_destroy_interface+0x313/0x3d0
...

Move the put_device(real_dev) to vlan_dev_free(). Ensure
real_dev not be freed before vlan_dev unregistered.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: syzbot+e4df4e1389e28972e955@syzkaller.appspotmail.com
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-11-03 14:19:23 +00:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-07-22 16:19:03 +02:00
9p net/9p: increase default msize to 128k 2021-09-05 08:36:44 +09:00
802 llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
8021q net: vlan: fix a UAF in vlan_dev_real_dev() 2021-11-03 14:19:23 +00:00
appletalk net: socket: rework compat_ifreq_ioctl() 2021-07-23 14:20:25 +01:00
atm net: atm: use address setting helpers 2021-10-24 13:59:45 +01:00
ax25 ax25: constify dev_addr passing 2021-10-13 09:40:45 -07:00
batman-adv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
bluetooth bluetooth: use dev_addr_set() 2021-10-25 11:01:29 -07:00
bpf bpf: Add dummy BPF STRUCT_OPS for test purpose 2021-11-01 14:10:00 -07:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-11-01 20:05:14 -07:00
caif net: caif: get ready for const netdev->dev_addr 2021-10-24 13:59:45 +01:00
can can: bcm: Use hrtimer_forward_now() 2021-10-24 16:24:28 +02:00
ceph Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
core net: avoid double accounting for pure zerocopy skbs 2021-11-03 11:19:49 +00:00
dcb
dccp tcp: switch orphan_count to bare per-cpu counters 2021-10-15 11:28:34 +01:00
decnet net: Remove redundant if statements 2021-08-05 13:27:50 +01:00
dns_resolver
dsa net: dsa: populate supported_interfaces member 2021-11-01 13:06:32 +00:00
ethernet eth: platform: add a helper for loading netdev->dev_addr 2021-10-08 14:54:33 +01:00
ethtool ethtool: fix ethtool msg len calculation for pause stats 2021-11-03 11:20:45 +00:00
hsr net: hsr: Add support for redbox supervision frames 2021-10-26 14:52:17 +01:00
ieee802154 mac802154: use dev_addr_set() - manual 2021-10-20 14:27:40 +01:00
ife
ipv4 net: avoid double accounting for pure zerocopy skbs 2021-11-03 11:19:49 +00:00
ipv6 net: udp6: replace __UDP_INC_STATS() with __UDP6_INC_STATS() 2021-11-03 14:00:23 +00:00
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 net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
mac802154 mac802154: use dev_addr_set() - manual 2021-10-20 14:27:40 +01:00
mctp mctp: Pass flow data & flow release events to drivers 2021-10-29 13:23:51 +01:00
mpls mpls: defer ttl decrement in mpls_forward() 2021-07-23 17:17:56 +01:00
mptcp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
ncsi net/ncsi: add get MAC address command to get Intel i210 MAC address 2021-09-01 17:18:56 -07:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf 2021-11-02 18:02:54 -07:00
netlabel net: fix NULL pointer reference in cipso_v4_doi_free 2021-08-30 12:23:18 +01:00
netlink Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-07 15:24:06 -07:00
netrom ax25: constify dev_addr passing 2021-10-13 09:40:45 -07:00
nfc NFC: add necessary privilege flags in netlink layer 2021-11-03 11:15:18 +00:00
nsh
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-08-19 18:09:18 -07:00
packet af_packet: Introduce egress hook 2021-10-14 23:06:44 +02:00
phonet net: Remove redundant if statements 2021-08-05 13:27:50 +01:00
psample
qrtr net: qrtr: combine nameservice into main module 2021-09-28 17:36:43 -07:00
rds net/rds: dma_map_sg is entitled to merge entries 2021-08-18 15:35:50 -07:00
rfkill
rose rose: constify dev_addr passing 2021-10-13 09:40:45 -07:00
rxrpc rxrpc: Fix _usecs_to_jiffies() by using usecs_to_jiffies() 2021-09-24 14:18:34 +01:00
sched Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-11-01 20:05:14 -07:00
sctp security: add sctp_assoc_established hook 2021-11-03 11:09:20 +00:00
smc net/smc: Introduce tracepoint for smcr link down 2021-11-01 13:39:14 +00:00
strparser net: sock: introduce sk_error_report 2021-06-29 11:28:21 -07:00
sunrpc Bug fixes for NFSD error handling paths 2021-10-07 14:11:40 -07:00
switchdev net: switchdev: merge switchdev_handle_fdb_{add,del}_to_device 2021-10-27 14:54:02 +01:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
tls Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
unix net: Implement ->sock_is_readable() for UDP and AF_UNIX 2021-10-26 12:29:33 -07:00
vmw_vsock vsock: Enable y2038 safe timeval for timeout 2021-10-08 16:21:53 +01:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
x25 net: x25: Use list_for_each_entry() to simplify code in x25_route.c 2021-06-10 14:08:09 -07:00
xdp xsk: Fix clang build error in __xp_alloc 2021-09-29 13:59:13 +02:00
xfrm Core: 2021-11-02 06:20:58 -07:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig net/core: disable NET_RX_BUSY_POLL on PREEMPT_RT 2021-10-01 15:45:10 -07:00
Makefile mctp: Add MCTP base 2021-07-29 15:06:49 +01:00
socket.c Core: 2021-08-31 16:43:06 -07:00
sysctl_net.c