Ursula Braun 90e0e78bfa net/smc: add fallback check to connect() ...

commit 86434744fe upstream.

FASTOPEN setsockopt() or sendmsg() may switch the SMC socket to fallback
mode. Once fallback mode is active, the native TCP socket functions are
called. Nevertheless there is a small race window, when FASTOPEN
setsockopt/sendmsg runs in parallel to a connect(), and switch the
socket into fallback mode before connect() takes the sock lock.
Make sure the SMC-specific connect setup is omitted in this case.

This way a syzbot-reported refcount problem is fixed, triggered by
different threads running non-blocking connect() and FASTOPEN_KEY
setsockopt.

Reported-by: syzbot+96d3f9ff6a86d37e44c8@syzkaller.appspotmail.com
Fixes: 6d6dd528d5 ("net/smc: fix refcount non-blocking connect() -part 2")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2020-01-04 19:18:37 +01:00

..

af_smc.c

net/smc: add fallback check to connect()

2020-01-04 19:18:37 +01:00

Kconfig

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21 10:50:46 +02:00

Makefile

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21 10:50:46 +02:00

smc_cdc.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2019-02-15 12:38:38 -08:00

smc_cdc.h

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2019-02-15 12:38:38 -08:00

smc_clc.c

net: use new in_dev_ifa iterators

2019-06-02 18:06:26 -07:00

smc_clc.h

net/smc: improve smc_conn_create reason codes

2019-04-12 10:50:56 -07:00

smc_close.c

net/smc: wait for pending work before clcsock release_sock

2019-04-11 11:04:08 -07:00

smc_close.h

net/smc: wait for pending work before clcsock release_sock

2019-04-11 11:04:08 -07:00

smc_core.c

net/smc: increase device refcount for added link group

2019-12-31 16:43:53 +01:00

smc_core.h

net/smc: improve smc_conn_create reason codes

2019-04-12 10:50:56 -07:00

smc_diag.c

treewide: Add SPDX license identifier for more missed files

2019-05-21 10:50:45 +02:00

smc_ib.c

net/smc: Use rdma_read_gid_l2_fields to L2 fields

2019-05-03 11:10:03 -03:00

smc_ib.h

net/smc: rework pnet table

2019-02-21 10:34:37 -08:00

smc_ism.c

net/smc: fix a NULL pointer dereference

2019-04-11 11:04:08 -07:00

smc_ism.h

net/smc: add SMC-D shutdown signal

2018-11-21 16:14:56 -08:00

smc_llc.c

net/smc: preallocated memory for rdma work requests

2019-02-04 09:11:19 -08:00

smc_llc.h

net/smc: add infrastructure to send delete rkey messages

2018-11-23 17:20:32 -08:00

smc_netns.h

net/smc: add pnet table namespace support

2019-02-21 10:34:37 -08:00

smc_pnet.c

net/smc: fix ethernet interface refcounting

2019-11-06 17:44:32 -08:00

smc_pnet.h

net/smc: consolidate function parameters

2019-04-12 10:50:56 -07:00

smc_rx.c

net/smc: receive pending data after RCV_SHUTDOWN

2019-10-10 19:08:41 -07:00

smc_rx.h

smc: add support for splice()

2018-05-04 11:45:06 -04:00

smc_tx.c

net/smc: make sure EPOLLOUT is raised

2019-08-20 12:25:14 -07:00

smc_tx.h

net/smc: eliminate cursor read and write calls

2018-07-23 10:57:14 -07:00

smc_wr.c

net/smc: preallocated memory for rdma work requests

2019-02-04 09:11:19 -08:00

smc_wr.h

net/smc: preallocated memory for rdma work requests

2019-02-04 09:11:19 -08:00

smc.h

net/smc: nonblocking connect rework

2019-04-12 10:50:56 -07:00