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Eric Dumazet b357a364c5 inet: fix possible panic in reqsk_queue_unlink() 
[ 3897.923145] BUG: unable to handle kernel NULL pointer dereference at
 0000000000000080
[ 3897.931025] IP: [<ffffffffa9f27686>] reqsk_timer_handler+0x1a6/0x243

There is a race when reqsk_timer_handler() and tcp_check_req() call
inet_csk_reqsk_queue_unlink() on the same req at the same time.

Before commit fa76ce7328 ("inet: get rid of central tcp/dccp listener
timer"), listener spinlock was held and race could not happen.

To solve this bug, we change reqsk_queue_unlink() to not assume req
must be found, and we return a status, to conditionally release a
refcount on the request sock.

This also means tcp_check_req() in non fastopen case might or not
consume req refcount, so tcp_v6_hnd_req() & tcp_v4_hnd_req() have
to properly handle this.

(Same remark for dccp_check_req() and its callers)

inet_csk_reqsk_queue_drop() is now too big to be inlined, as it is
called 4 times in tcp and 3 times in dccp.

Fixes: fa76ce7328 ("inet: get rid of central tcp/dccp listener timer")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2015-04-24 11:39:15 -04:00
..
6lowpan 6lowpan: nhc: add other known rfc6282 compressions 2015-02-14 23:08:44 +01:00
9p 9p: patches for 4.1 merge window 2015-04-18 17:45:30 -04:00
802 net: Kill dev_rebuild_header 2015-03-02 16:43:41 -05:00
8021q vlan: implement ndo_get_iflink 2015-04-02 14:05:00 -04:00
appletalk appletalk: Use eth_<foo>_addr instead of memset 2015-03-03 17:01:37 -05:00
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-04-15 09:00:47 -07:00
ax25 ax25: Fix the build when CONFIG_INET is disabled 2015-03-05 13:17:39 -05:00
batman-adv dev: introduce dev_get_iflink() 2015-04-02 14:04:59 -04:00
bluetooth Bluetooth: hidp: Fix regression with older userspace and flags validation 2015-04-18 11:01:08 -04:00
bridge netfilter: nf_tables: switch registers to 32 bit addressing 2015-04-13 17:17:29 +02:00
caif Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-03-20 18:51:09 -04:00
can can: introduce new raw socket option to join the given CAN filters 2015-04-01 11:28:22 +02:00
ceph Revert "libceph: use memalloc flags for net IO" 2015-04-07 19:08:35 +03:00
core net: do not deplete pfmemalloc reserve 2015-04-22 16:24:59 -04:00
dcb net/dcb: Add IEEE QCN attribute 2015-03-06 21:50:02 -05:00
dccp inet: fix possible panic in reqsk_queue_unlink() 2015-04-24 11:39:15 -04:00
decnet netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
dns_resolver Merge commit 'v3.16' into next 2014-10-01 00:44:04 +10:00
dsa net: dsa: use DEVICE_ATTR_RW to declare temp1_max 2015-04-17 15:58:37 -04:00
ethernet ethernet: Use eth_<foo>_addr instead of memset 2015-03-03 17:01:38 -05:00
hsr net/hsr: Fix NULL pointer dereference and refcnt bugs when deleting a HSR interface. 2015-03-01 13:40:23 -05:00
ieee802154 ieee802154: don't export static symbol 2015-03-14 17:11:31 +01:00
ipv4 inet: fix possible panic in reqsk_queue_unlink() 2015-04-24 11:39:15 -04:00
ipv6 inet: fix possible panic in reqsk_queue_unlink() 2015-04-24 11:39:15 -04:00
ipx net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
irda Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-03-09 23:38:02 -04:00
iucv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-04-02 16:16:53 -04:00
key xfrm: simplify xfrm_address_t use 2015-03-31 13:58:35 -04:00
l2tp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-04-06 22:34:15 -04:00
lapb lapb: move EXPORT_SYMBOL after functions. 2014-10-24 15:51:42 -04:00
llc net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-04-15 09:00:47 -07:00
mac802154 mac802154: cleanup concurrent check 2015-03-27 19:18:50 +01:00
mpls mpls: Prevent use of implicit NULL label as outgoing label 2015-04-22 14:24:54 -04:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2015-04-14 18:51:19 -04:00
netlabel netlink: implement nla_put_in_addr and nla_put_in6_addr 2015-03-31 13:58:35 -04:00
netlink rhashtable: provide len to obj_hashfn 2015-03-25 17:18:33 +01:00
netrom net: Kill dev_rebuild_header 2015-03-02 16:43:41 -05:00
nfc nfc: Fix portid type in urelease_work 2015-04-13 16:35:16 -04:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-04-15 09:00:47 -07:00
packet af_packet: pass checksum validation status to the user 2015-03-23 22:01:28 -04:00
phonet net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-04-14 15:44:14 -04:00
rfkill Last round of updates for net-next: 2015-02-04 14:57:45 -08:00
rose net: Kill dev_rebuild_header 2015-03-02 16:43:41 -05:00
rxrpc new helper: msg_data_left() 2015-04-11 15:53:35 -04:00
sched act_mirred: Fix bogus header when redirecting from VLAN 2015-04-17 13:29:28 -04:00
sctp sctp: avoid to repeatedly declare external variables 2015-03-25 11:40:16 -04:00
sunrpc lib/string_helpers.c: change semantics of string_escape_mem 2015-04-15 16:35:24 -07:00
switchdev switchdev: fix stp update API to work with layered netdevices 2015-03-23 16:44:56 -04:00
tipc tipc: fix node refcount issue 2015-04-23 11:50:34 -04:00
unix net: unix: garbage: fixed several comment and whitespace style issues 2015-04-23 13:15:20 -04:00
vmw_vsock net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
wimax wimax: convert printk to pr_foo() 2014-10-07 20:28:44 -04:00
wireless cfg80211: don't allow disabling WEXT if it's required 2015-04-08 09:19:29 +02:00
x25 net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-04-14 15:44:14 -04:00
Kconfig kconfig: use bool instead of boolean for type definition attributes 2015-01-07 13:08:04 +01:00
Makefile mpls: Refactor how the mpls module is built 2015-03-04 00:26:06 -05:00
compat.c net: switch importing msghdr from userland to {compat_,}import_iovec() 2015-04-09 00:02:26 -04:00
socket.c make new_sync_{read,write}() static 2015-04-11 22:29:40 -04:00
sysctl_net.c
…