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Florian Westphal aed728c38c ipv6: avoid write to a possibly cloned skb 
[ Upstream commit 79e49503efe53a8c51d8b695bedc8a346c5e4a87 ]

ip6_fragment, in case skb has a fraglist, checks if the
skb is cloned.  If it is, it will move to the 'slow path' and allocates
new skbs for each fragment.

However, right before entering the slowpath loop, it updates the
nexthdr value of the last ipv6 extension header to NEXTHDR_FRAGMENT,
to account for the fragment header that will be inserted in the new
ipv6-fragment skbs.

In case original skb is cloned this munges nexthdr value of another
skb.  Avoid this by doing the nexthdr update for each of the new fragment
skbs separately.

This was observed with tcpdump on a bridge device where netfilter ipv6
reassembly is active:  tcpdump shows malformed fragment headers as
the l4 header (icmpv6, tcp, etc). is decoded as a fragment header.

Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Reported-by: Andreas Karis <akaris@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-03-22 12:04:17 +01:00
..
6lowpan 6lowpan: put mcast compression in an own function 2015-10-21 00:49:25 +02:00
9p IB/cma: Add support for network namespaces 2015-10-28 12:32:48 -04:00
802
8021q net: add recursion limit to GRO 2016-11-15 07:46:38 +01:00
appletalk
atm atm: deal with setting entry before mkip was called 2015-09-17 22:13:32 -07:00
ax25 ax25: Fix segfault after sock connection timeout 2017-02-04 09:45:09 +01:00
batman-adv batman-adv: Check for alloc errors when preparing TT local data 2016-12-15 08:49:23 -08:00
bluetooth Bluetooth: Fix l2cap_sock_setsockopt() with optname BT_RCVMTU 2016-08-20 18:09:19 +02:00
bridge bridge: netlink: call br_changelink() during br_dev_newlink() 2017-02-04 09:45:09 +01:00
caif net: caif: fix misleading indentation 2016-09-30 10:18:35 +02:00
can can: Fix kernel panic at security_sock_rcv_skb 2017-02-18 16:39:26 +01:00
ceph libceph: verify authorize reply on connect 2017-01-09 08:07:52 +01:00
core net: fix socket refcounting in skb_complete_tx_timestamp() 2017-03-22 12:04:15 +01:00
dcb net/dcb: make dcbnl.c explicitly non-modular 2015-10-09 07:52:27 -07:00
dccp dccp: fix use-after-free in dccp_feat_activate_values 2017-03-22 12:04:15 +01:00
decnet decnet: Do not build routes to devices without decnet private data. 2016-05-18 17:06:35 -07:00
dns_resolver net: dns_resolver: convert time_t to time64_t 2015-11-18 16:27:46 -05:00
dsa net: dsa: Bring back device detaching in dsa_slave_suspend() 2017-02-04 09:45:10 +01:00
ethernet net: introduce device min_header_len 2017-02-18 16:39:27 +01:00
hsr net/hsr: fix a warning message 2015-11-23 14:56:15 -05:00
ieee802154 net: fix percpu memory leaks 2015-11-02 22:47:14 -05:00
ipv4 tcp: fix various issues for sockets morphing to listen state 2017-03-22 12:04:15 +01:00
ipv6 ipv6: avoid write to a possibly cloned skb 2017-03-22 12:04:17 +01:00
ipx
irda irda: Fix lockdep annotations in hashbin_delete(). 2017-02-26 11:07:50 +01:00
iucv af_iucv: Validate socket address length in iucv_sock_bind() 2016-03-03 15:07:03 -08:00
key af_key: fix two typos 2015-10-23 03:05:19 -07:00
l2tp l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv 2017-03-22 12:04:14 +01:00
l3mdev net: Add netif_is_l3_slave 2015-10-07 04:27:43 -07:00
lapb
llc net/llc: avoid BUG_ON() in skb_orphan() 2017-02-26 11:07:49 +01:00
mac80211 mac80211: flush delayed work when entering suspend 2017-03-15 09:57:14 +08:00
mac802154 mac802154: llsec: use kzfree 2015-10-21 00:49:24 +02:00
mpls mpls: Send route delete notifications when router module is unloaded 2017-03-22 12:04:16 +01:00
netfilter netfilter: nft_dynset: fix element timeout for HZ != 1000 2016-11-26 09:54:54 +01:00
netlabel netlabel: add address family checks to netlbl_{sock,req}_delattr() 2016-08-20 18:09:22 +02:00
netlink netlink: remove mmapped netlink support 2017-03-22 12:04:13 +01:00
netrom
nfc net: rename SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA 2015-12-01 15:45:05 -05:00
openvswitch openvswitch: maintain correct checksum state in conntrack actions 2017-02-04 09:45:09 +01:00
packet net: don't call strlen() on the user buffer in packet_bind_spkt() 2017-03-22 12:04:14 +01:00
phonet phonet: properly unshare skbs in phonet_rcv() 2016-01-31 11:29:00 -08:00
rds rds: fix an infoleak in rds_inc_info_copy 2016-09-15 08:27:51 +02:00
rfkill rfkill: fix rfkill_fop_read wait_event usage 2016-03-03 15:07:26 -08:00
rose
rxrpc net: rename SOCK_ASYNC_NOSPACE and SOCK_ASYNC_WAITDATA 2015-12-01 15:45:05 -05:00
sched act_connmark: avoid crashing on malformed nlattrs with null parms 2017-03-22 12:04:16 +01:00
sctp sctp: avoid BUG_ON on sctp_wait_for_sndbuf 2017-02-18 16:39:27 +01:00
sunrpc svcrpc: fix oops in absence of krb5 module 2017-02-09 08:02:45 +01:00
switchdev switchdev: pass pointer to fib_info instead of copy 2016-06-24 10:18:16 -07:00
tipc tipc: fix NULL pointer dereference in shutdown() 2016-09-30 10:18:36 +02:00
unix af_unix: move unix_mknod() out of bindlock 2017-02-04 09:45:09 +01:00
vmw_vsock VSOCK: do not disconnect socket when peer has shutdown SEND only 2016-05-18 17:06:41 -07:00
wimax net:wimax: Fix doucble word "the the" in networking.xml 2015-08-09 22:43:52 -07:00
wireless nl80211: fix sched scan netlink socket owner destruction 2017-01-19 20:17:20 +01:00
x25 net: fix a kernel infoleak in x25 module 2016-05-18 17:06:43 -07:00
xfrm xfrm: Fix crash observed during device unregistration and decryption 2016-04-20 15:42:05 +09:00
compat.c
Kconfig net: Introduce L3 Master device abstraction 2015-09-29 20:40:32 -07:00
Makefile net: Introduce L3 Master device abstraction 2015-09-29 20:40:32 -07:00
socket.c net: socket: fix recvmmsg not returning error from sock_error 2017-02-26 11:07:50 +01:00
sysctl_net.c net: Use ns_capable_noaudit() when determining net sysctl permissions 2016-09-15 08:27:50 +02:00