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Linus Lüssing 8a4023c5b5 batman-adv: Fix potential synchronization issues in mcast tvlv handler 
So far the mcast tvlv handler did not anticipate the processing of
multiple incoming OGMs from the same originator at the same time. This
can lead to various issues:

* Broken refcounting: For instance two mcast handlers might both assume
  that an originator just got multicast capabilities and will together
  wrongly decrease mcast.num_disabled by two, potentially leading to
  an integer underflow.

* Potential kernel panic on hlist_del_rcu(): Two mcast handlers might
  one after another try to do an
  hlist_del_rcu(&orig->mcast_want_all_*_node). The second one will
  cause memory corruption / crashes.
  (Reported by: Sven Eckelmann <sven@narfation.org>)

Right in the beginning the code path makes assumptions about the current
multicast related state of an originator and bases all updates on that. The
easiest and least error prune way to fix the issues in this case is to
serialize multiple mcast handler invocations with a spinlock.

Fixes: 60432d756c ("batman-adv: Announce new capability via multicast TVLV")
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
 		2015-08-14 22:52:08 +02:00
..
6lowpan 6lowpan: add request for ipv6 module 2015-07-23 17:10:48 +02:00
9p virtio/vhost: fixes for 4.2 2015-07-23 13:07:04 -07:00
802
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8021q vlan: Add GRO support for non hardware accelerated vlan 2015-06-01 16:50:52 -07:00
appletalk net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
atm br2684: Remove unnecessary formatting macros b1 and bs 2015-07-31 15:25:52 -07:00
ax25 NET: AX.25: Stop heartbeat timer on disconnect. 2015-07-15 15:59:58 -07:00
batman-adv batman-adv: Fix potential synchronization issues in mcast tvlv handler 2015-08-14 22:52:08 +02:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-07-31 23:52:20 -07:00
bridge bridge: netlink: add support for vlan_filtering attribute 2015-08-10 13:36:43 -07:00
caif caif: fix leaks and race in caif_queue_rcv_skb() 2015-07-21 00:02:44 -07:00
can can: replace timestamp as unique skb attribute 2015-07-12 21:13:22 +02:00
ceph libceph: treat sockaddr_storage with uninitialized family as blank 2015-07-09 20:30:34 +03:00
core net: add explicit logging and stat for neighbour table overflow 2015-08-10 13:46:21 -07:00
dcb net/dcb: Add IEEE QCN attribute 2015-03-06 21:50:02 -05:00
dccp tcp: fix recv with flags MSG_WAITALL | MSG_PEEK 2015-07-27 01:06:53 -07:00
decnet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
dns_resolver
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dsa dsa: Support multiple MDIO busses 2015-08-10 14:25:02 -07:00
ethernet net: ethernet: Fix double word "the the" in eth.c 2015-08-09 22:53:00 -07:00
hsr
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ieee802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-07-31 23:52:20 -07:00
ipv4 gre: Remove support for sharing GRE protocol hook. 2015-08-10 14:03:54 -07:00
ipv6 ip_gre: Add support to collect tunnel metadata. 2015-08-10 14:03:54 -07:00
ipx net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
irda irda: use msecs_to_jiffies for conversion to jiffies 2015-05-25 17:46:21 -04:00
iucv net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
key Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-06-24 16:49:49 -07:00
l2tp net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
lapb
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llc tcp: fix recv with flags MSG_WAITALL | MSG_PEEK 2015-07-27 01:06:53 -07:00
mac80211 cfg80211: use RTNL locked reg_can_beacon for IR-relaxation 2015-07-17 15:02:02 +02:00
mac802154 mac802154: Fix memory corruption with global deferred transmit state. 2015-07-30 14:08:55 +02:00
mpls mpls: Enforce payload type of traffic sent using explicit NULL 2015-08-09 22:51:42 -07:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2015-08-04 23:57:45 -07:00
netlabel netlink: implement nla_put_in_addr and nla_put_in6_addr 2015-03-31 13:58:35 -04:00
netlink netlink: don't hold mutex in rcu callback when releasing mmapd ring 2015-07-21 22:22:56 -07:00
netrom netfilter: Remove spurios included of netfilter.h 2015-06-18 21:14:32 +02:00
nfc NFC: nci: fix mistake in uart generic driver 2015-06-15 18:10:37 +02:00
openvswitch openvswitch: Use regular GRE net_device instead of vport 2015-08-10 14:03:54 -07:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-07-31 23:52:20 -07:00
phonet net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
rds RDS-TCP: Support multiple RDS-TCP listen endpoints, one per netns. 2015-08-07 11:29:58 -07:00
rfkill net: rfkill: gpio: make better use of gpiod API 2015-05-29 13:13:45 +02:00
rose Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
rxrpc net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
sched act_bpf: properly support late binding of bpf action to a classifier 2015-08-03 16:05:56 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-07-31 23:52:20 -07:00
sunrpc NFS client bugfixes for Linux 4.2 2015-07-28 09:37:44 -07:00
switchdev net: switchdev: support static FDB addresses 2015-08-09 22:48:09 -07:00
tipc ipv6: change ipv6_stub_impl.ipv6_dst_lookup to take net argument 2015-07-31 15:21:30 -07:00
unix net/unix: support SCM_SECURITY for stream sockets 2015-06-10 22:49:20 -07:00
vmw_vsock net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
wimax net:wimax: Fix doucble word "the the" in networking.xml 2015-08-09 22:43:52 -07:00
wireless cfg80211: use RTNL locked reg_can_beacon for IR-relaxation 2015-07-17 15:02:02 +02:00
x25 net: Pass kern from net_proto_family.create to sk_alloc 2015-05-11 10:50:17 -04:00
xfrm xfrm: Fix a typo 2015-07-21 00:28:36 -07:00
Kconfig lwtunnel: infrastructure for handling light weight tunnels like mpls 2015-07-21 10:39:03 -07:00
Makefile
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compat.c net: switch importing msghdr from userland to {compat_,}import_iovec() 2015-04-09 00:02:26 -04:00
socket.c net: Add a struct net parameter to sock_create_kern 2015-05-11 10:50:17 -04:00
sysctl_net.c
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