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Hendrik Brueckner bf95d20fdb af_iucv: fix race when queueing skbs on the backlog queue 
iucv_sock_recvmsg() and iucv_process_message()/iucv_fragment_skb race
for dequeuing an skb from the backlog queue.

If iucv_sock_recvmsg() dequeues first, iucv_process_message() calls
sock_queue_rcv_skb() with an skb that is NULL.

This results in the following kernel panic:

<1>Unable to handle kernel pointer dereference at virtual kernel address (null)
<4>Oops: 0004 [#1] PREEMPT SMP DEBUG_PAGEALLOC
<4>Modules linked in: af_iucv sunrpc qeth_l3 dm_multipath dm_mod vmur qeth ccwgroup
<4>CPU: 0 Not tainted 2.6.30 #4
<4>Process client-iucv (pid: 4787, task: 0000000034e75940, ksp: 00000000353e3710)
<4>Krnl PSW : 0704000180000000 000000000043ebca (sock_queue_rcv_skb+0x7a/0x138)
<4>           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3
<4>Krnl GPRS: 0052900000000000 000003e0016e0fe8 0000000000000000 0000000000000000
<4>           000000000043eba8 0000000000000002 0000000000000001 00000000341aa7f0
<4>           0000000000000000 0000000000007800 0000000000000000 0000000000000000
<4>           00000000341aa7f0 0000000000594650 000000000043eba8 000000003fc2fb28
<4>Krnl Code: 000000000043ebbe: a7840006            brc     8,43ebca
<4>           000000000043ebc2: 5930c23c            c       %r3,572(%r12)
<4>           000000000043ebc6: a724004c            brc     2,43ec5e
<4>          >000000000043ebca: e3c0b0100024        stg     %r12,16(%r11)
<4>           000000000043ebd0: a7190000            lghi    %r1,0
<4>           000000000043ebd4: e310b0200024        stg     %r1,32(%r11)
<4>           000000000043ebda: c010ffffdce9        larl    %r1,43a5ac
<4>           000000000043ebe0: e310b0800024        stg     %r1,128(%r11)
<4>Call Trace:
<4>([<000000000043eba8>] sock_queue_rcv_skb+0x58/0x138)
<4> [<000003e0016bcf2a>] iucv_process_message+0x112/0x3cc [af_iucv]
<4> [<000003e0016bd3d4>] iucv_callback_rx+0x1f0/0x274 [af_iucv]
<4> [<000000000053a21a>] iucv_message_pending+0xa2/0x120
<4> [<000000000053b5a6>] iucv_tasklet_fn+0x176/0x1b8
<4> [<000000000014fa82>] tasklet_action+0xfe/0x1f4
<4> [<0000000000150a56>] __do_softirq+0x116/0x284
<4> [<0000000000111058>] do_softirq+0xe4/0xe8
<4> [<00000000001504ba>] irq_exit+0xba/0xd8
<4> [<000000000010e0b2>] do_extint+0x146/0x190
<4> [<00000000001184b6>] ext_no_vtime+0x1e/0x22
<4> [<00000000001fbf4e>] kfree+0x202/0x28c
<4>([<00000000001fbf44>] kfree+0x1f8/0x28c)
<4> [<000000000044205a>] __kfree_skb+0x32/0x124
<4> [<000003e0016bd8b2>] iucv_sock_recvmsg+0x236/0x41c [af_iucv]
<4> [<0000000000437042>] sock_aio_read+0x136/0x160
<4> [<0000000000205e50>] do_sync_read+0xe4/0x13c
<4> [<0000000000206dce>] vfs_read+0x152/0x15c
<4> [<0000000000206ed0>] SyS_read+0x54/0xac
<4> [<0000000000117c8e>] sysc_noemu+0x10/0x16
<4> [<00000042ff8def3c>] 0x42ff8def3c

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-16 20:57:39 -07:00
..
9p net/9p: insulate the client against an invalid error code sent by a 9p server 2009-08-17 16:39:54 -05:00
802 net: remove COMPAT_NET_DEV_OPS 2009-05-25 01:53:53 -07:00
8021q vlan: adds drops accounting 2009-09-03 20:02:17 -07:00
appletalk Have atalk_route_packet() return NET_RX_SUCCESS not NET_XMIT_SUCCESS 2009-09-14 17:02:47 -07:00
atm atm/br2684: netif_stop_queue() when atm device busy and netif_wake_queue() when we can send packets again. 2009-09-02 23:46:10 -07:00
ax25 net: Move rx skb_orphan call to where needed 2009-06-23 16:36:25 -07:00
bluetooth net: Add DEVTYPE support for Ethernet based devices 2009-09-11 12:54:55 -07:00
bridge net: Add DEVTYPE support for Ethernet based devices 2009-09-11 12:54:55 -07:00
can can: fix NOHZ local_softirq_pending 08 warning 2009-09-15 01:31:34 -07:00
core bonding: remap muticast addresses without using dev_close() and dev_open() 2009-09-15 02:37:40 -07:00
dcb dcbnl: Add implementations of dcbnl setapp/getapp commands 2009-09-01 01:24:36 -07:00
dccp net: constify remaining proto_ops 2009-09-14 17:03:09 -07:00
decnet net: make neigh_ops constant 2009-09-01 17:40:57 -07:00
dsa netdev: convert pseudo-devices to netdev_tx_t 2009-09-01 01:13:07 -07:00
econet Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
ethernet net: remove COMPAT_NET_DEV_OPS 2009-05-25 01:53:53 -07:00
ieee802154 ieee802154: add locking for seq numbers 2009-09-15 18:25:16 +04:00
ipv4 tcp: fix CONFIG_TCP_MD5SIG + CONFIG_PREEMPT timer BUG() 2009-09-15 23:49:21 -07:00
ipv6 ipv6: Ignore route option with ROUTER_PREF_INVALID 2009-09-16 17:10:38 -07:00
ipx headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
irda net: file_operations should be const 2009-09-02 01:03:53 -07:00
iucv af_iucv: fix race when queueing skbs on the backlog queue 2009-09-16 20:57:39 -07:00
key net: file_operations should be const 2009-09-02 01:03:53 -07:00
lapb net: remove NET_RX_BAD and NET_RX_CN* defines 2009-07-05 19:15:35 -07:00
llc Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-09-02 00:32:56 -07:00
mac80211 rc80211_minstrel: fix contention window calculation 2009-09-16 16:21:00 -04:00
netfilter Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2009-09-10 18:17:09 -07:00
netlabel Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-07-30 19:22:43 -07:00
netlink genetlink: fix netns vs. netlink table locking 2009-09-14 17:02:50 -07:00
netrom Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-09-02 00:32:56 -07:00
packet af_packet: style cleanups 2009-07-23 18:01:10 -07:00
phonet Phonet: Netlink event for autoconfigured addresses 2009-09-14 17:03:27 -07:00
rds net: constify remaining proto_ops 2009-09-14 17:03:09 -07:00
rfkill rfkill: add the GPS radio type 2009-08-04 16:44:23 -04:00
rose net: constify remaining proto_ops 2009-09-14 17:03:09 -07:00
rxrpc RxRPC: Use uX/sX rather than uintX_t/intX_t types 2009-09-16 00:01:13 -07:00
sched pkt_sched: Fix qdisc_create on stab error handling 2009-09-15 23:42:05 -07:00
sctp net: constify struct inet6_protocol 2009-09-14 17:03:05 -07:00
sunrpc Merge branch 'nfs-for-2.6.32' 2009-09-11 14:59:37 -04:00
tipc tipc: fix test of bearer_priority range in tipc_register_media() 2009-08-29 00:19:42 -07:00
unix net: unix: fix sending fds in multiple buffers 2009-09-11 11:31:45 -07:00
wanrouter headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
wimax wimax: fix warning caused by not checking retval of rfkill_set_hw_state() 2009-06-11 11:12:48 -07:00
wireless cfg80211: fix SME connect 2009-09-16 16:21:00 -04:00
x25 headers: smp_lock.h redux 2009-07-12 12:22:34 -07:00
xfrm net: file_operations should be const 2009-09-02 01:03:53 -07:00
compat.c net/compat/wext: send different messages to compat tasks 2009-07-15 08:53:39 -07:00
Kconfig net/compat/wext: send different messages to compat tasks 2009-07-15 08:53:39 -07:00
Makefile net: remove redundant sched/ in net/Makefile 2009-07-12 20:11:14 -07:00
nonet.c
socket.c [PATCH] net: kmemcheck annotation in struct socket 2009-09-15 02:39:20 -07:00
sysctl_net.c net: sysctl_net - use net_eq to compare nets 2009-03-16 16:23:30 +01:00
TUNABLE