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Xie He 217846b2c3 net: lapb: Copy the skb before sending a packet 
[ Upstream commit 88c7a9fd9bdd3e453f04018920964c6f848a591a ]

When sending a packet, we will prepend it with an LAPB header.
This modifies the shared parts of a cloned skb, so we should copy the
skb rather than just clone it, before we prepend the header.

In "Documentation/networking/driver.rst" (the 2nd point), it states
that drivers shouldn't modify the shared parts of a cloned skb when
transmitting.

The "dev_queue_xmit_nit" function in "net/core/dev.c", which is called
when an skb is being sent, clones the skb and sents the clone to
AF_PACKET sockets. Because the LAPB drivers first remove a 1-byte
pseudo-header before handing over the skb to us, if we don't copy the
skb before prepending the LAPB header, the first byte of the packets
received on AF_PACKET sockets can be corrupted.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Acked-by: Martin Schiller <ms@dev.tdt.de>
Link: https://lore.kernel.org/r/20210201055706.415842-1-xie.he.0141@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-04-12 12:51:53 +08:00
..
6lowpan Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
9p net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid 2021-03-16 16:39:51 +08:00
802 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
8021q net: vlan: avoid leaks on register_vlan_dev() failures 2021-04-12 12:51:15 +08:00
appletalk appletalk: Fix atalk_proc_init() return path 2021-03-16 16:33:09 +08:00
atm atm: fix a memory leak of vcc->user_back 2021-03-16 16:37:15 +08:00
ax25 AX.25: Prevent integer overflows in connect and sendmsg 2021-03-16 16:32:42 +08:00
batman-adv batman-adv: set .owner to THIS_MODULE 2021-03-16 16:41:41 +08:00
bluetooth Bluetooth: Fix null pointer dereference in hci_event_packet() 2021-03-16 16:42:42 +08:00
bpf Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bpfilter net/bpfilter: remove superfluous testing message 2021-03-16 16:26:23 +08:00
bridge bridge: Fix a deadlock when enabling multicast snooping 2021-03-16 16:42:17 +08:00
caif Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
can can: af_can: can_rx_unregister(): remove WARN() statement from list operation sanity check 2021-03-16 16:42:06 +08:00
ceph libceph: clear con->out_msg on Policy::stateful_server faults 2021-03-16 16:40:11 +08:00
core net_sched: gen_estimator: support large ewma log 2021-04-12 12:51:50 +08:00
dcb net: dcb: Accept RTM_GETDCB messages carrying set-like DCB commands 2021-04-12 12:51:30 +08:00
dccp dccp: Fix possible memleak in dccp_init and dccp_fini 2021-03-16 16:29:07 +08:00
decnet Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
dns_resolver KEYS: Don't write out to userspace while holding key semaphore 2021-03-16 16:26:42 +08:00
dsa dsa: Allow forwarding of redirected IGMP traffic 2021-03-16 16:36:11 +08:00
ethernet Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
hsr hsr: check protocol version in hsr_newlink() 2021-03-16 16:26:20 +08:00
ieee802154 Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ife Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ipv4 tcp: make TCP_USER_TIMEOUT accurate for zero window probes 2021-04-12 12:51:49 +08:00
ipv6 IPv6: reply ICMP error if the first fragment don't include all headers 2021-04-12 12:51:42 +08:00
iucv net/af_iucv: set correct sk_protocol for child sockets 2021-03-16 16:41:52 +08:00
kcm Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
key af_key: pfkey_dump needs parameter validation 2021-03-16 16:36:23 +08:00
l2tp l2tp: remove skb_dst_set() from l2tp_xmit_skb() 2021-03-16 16:31:43 +08:00
l3mdev Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
lapb net: lapb: Copy the skb before sending a packet 2021-04-12 12:51:53 +08:00
llc net: silence data-races on sk_backlog.tail 2021-03-16 16:36:36 +08:00
mac80211 mac80211: fix fast-rx encryption check 2021-04-12 12:51:50 +08:00
mac802154 mac802154: tx: fix use-after-free 2021-03-16 16:37:33 +08:00
mpls Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
ncsi net/ncsi: Use real net-device for response handler 2021-04-12 12:51:08 +08:00
netfilter netfilter: nft_dynset: add timeout extension to template 2021-04-12 12:51:45 +08:00
netlabel netlabel: fix an uninitialized warning in netlbl_unlabel_staticlist() 2021-03-16 16:41:06 +08:00
netlink genetlink: remove genl_bind 2021-03-16 16:31:42 +08:00
netrom net: netrom: Fix potential nr_neigh refcnt leak in nr_add_node 2021-03-16 16:26:51 +08:00
nfc NFC: fix possible resource leak 2021-04-12 12:51:48 +08:00
nsh Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
openvswitch net: openvswitch: ensure LSE is pullable before reading it 2021-03-16 16:41:57 +08:00
packet af_packet: TPACKET_V3: fix fill status rwlock imbalance 2021-03-16 16:33:48 +08:00
phonet Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
psample Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
qrtr net: qrtr: check skb_put_padto() return value 2021-03-16 16:36:30 +08:00
rds rds: Prevent kernel-infoleak in rds_notify_queue_get() 2021-03-16 16:32:48 +08:00
rfkill rfkill: Fix use-after-free in rfkill_resume() 2021-03-16 16:41:16 +08:00
rose rose: Fix Null pointer dereference in rose_send_frame() 2021-03-16 16:41:52 +08:00
rxrpc rxrpc: Fix deadlock around release of dst cached on udp tunnel 2021-04-12 12:51:53 +08:00
sched net_sched: reject silly cell_log in qdisc_get_rtab() 2021-04-12 12:51:40 +08:00
sctp net, sctp, filter: remap copy_from_user failure error 2021-04-12 12:51:31 +08:00
smc net/smc: fix direct access to ib_gid_addr->ndev in smc_ib_determine_gid() 2021-03-16 16:41:07 +08:00
strparser Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sunrpc net: sunrpc: interpret the return value of kstrtou32 correctly 2021-04-12 12:51:28 +08:00
switchdev net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP 2021-04-12 12:51:48 +08:00
tipc tipc: fix NULL deref in tipc_link_xmit() 2021-04-12 12:51:31 +08:00
tls net/tls: Protect from calling tls_dev_del for TLS RX twice 2021-03-16 16:41:52 +08:00
toa Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
unix skbuff: fix a data race in skb_queue_len() 2021-03-16 16:36:50 +08:00
vmw_vsock vsock: use ns_capable_noaudit() on socket create 2021-03-16 16:40:26 +08:00
wimax Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
wireless wext: fix NULL-ptr-dereference with cfg80211's lack of commit() 2021-04-12 12:51:43 +08:00
x25 net/x25: prevent a couple of overflows 2021-03-16 16:41:56 +08:00
xdp xsk: Replace datagram_poll by sock_poll_wait 2021-03-16 16:42:25 +08:00
xfrm xfrm: Fix wraparound in xfrm_policy_addr_delta() 2021-04-12 12:51:46 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
compat.c net/compat: Add missing sock updates for SCM_RIGHTS 2021-03-16 16:34:05 +08:00
socket.c net: Set fput_needed iff FDPUT_FPUT is set 2021-03-16 16:33:49 +08:00
sysctl_net.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00