Fabio M. De Francesco 7ff57e98fb net/smc: Use a mutex for locking "struct smc_pnettable" ... smc_pnetid_by_table_ib() uses read_lock() and then it calls smc_pnet_apply_ib() which, in turn, calls mutex_lock(&smc_ib_devices.mutex). read_lock() disables preemption. Therefore, the code acquires a mutex while in atomic context and it leads to a SAC bug. Fix this bug by replacing the rwlock with a mutex. Reported-and-tested-by: syzbot+4f322a6d84e991c38775@syzkaller.appspotmail.com Fixes: 64e28b52c7 ("net/smc: add pnet table namespace support") Confirmed-by: Tony Lu <tonylu@linux.alibaba.com> Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com> Acked-by: Karsten Graul <kgraul@linux.ibm.com> Link: https://lore.kernel.org/r/20220223100252.22562-1-fmdefrancesco@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2022-02-24 09:09:33 -08:00
..
af_smc.c	net/smc: Avoid overwriting the copies of clcsock callback functions	2022-02-11 11:10:29 +00:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile	net/smc: Introduce tracepoint for fallback	2021-11-01 13:39:14 +00:00
smc_cdc.c	net/smc: Introduce a new conn->lgr validity check helper	2022-01-13 13:14:53 +00:00
smc_cdc.h	net/smc: fix kernel panic caused by race of smc_sock	2021-12-28 12:42:45 +00:00
smc_clc.c	net/smc: Introduce a new conn->lgr validity check helper	2022-01-13 13:14:53 +00:00
smc_clc.h	net/smc: add v2 format of CLC decline message	2021-10-16 14:58:13 +01:00
smc_close.c	net/smc: Keep smc_close_final rc during active close	2021-12-02 12:14:36 +00:00
smc_close.h	net/smc: remove close abort worker	2019-10-22 11:23:44 -07:00
smc_core.c	net/smc: Fix hung_task when removing SMC-R devices	2022-01-16 12:30:28 +00:00
smc_core.h	net/smc: Resolve the race between SMC-R link access and clear	2022-01-13 13:14:53 +00:00
smc_diag.c	Partially revert "net/smc: Add netlink net namespace support"	2022-02-02 07:42:41 -08:00
smc_ib.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2021-12-31 14:35:40 +00:00
smc_ib.h	net/smc: Introduce net namespace support for linkgroup	2022-01-02 12:07:39 +00:00
smc_ism.c	net: Don't include filter.h from net/sock.h	2021-12-29 08:48:14 -08:00
smc_ism.h	net/smc: keep static copy of system EID	2021-09-14 12:49:10 +01:00
smc_llc.c	net/smc: Print net namespace in log	2022-01-02 12:07:39 +00:00
smc_llc.h	net/smc: extend LLC layer for SMC-Rv2	2021-10-16 14:58:13 +01:00
smc_netlink.c	net/smc: add generic netlink support for system EID	2021-09-14 12:49:10 +01:00
smc_netlink.h	net/smc: add support for user defined EIDs	2021-09-14 12:49:10 +01:00
smc_netns.h	net/smc: introduce list of pnetids for Ethernet devices	2020-09-28 15:19:03 -07:00
smc_pnet.c	net/smc: Use a mutex for locking "struct smc_pnettable"	2022-02-24 09:09:33 -08:00
smc_pnet.h	net/smc: Use a mutex for locking "struct smc_pnettable"	2022-02-24 09:09:33 -08:00
smc_rx.c	net/smc: Introduce tracepoints for tx and rx msg	2021-11-01 13:39:14 +00:00
smc_rx.h
smc_stats.c	net/smc: Fix ENODATA tests in smc_nl_get_fback_stats()	2021-06-21 12:16:58 -07:00
smc_stats.h	net/smc: Make SMC statistics network namespace aware	2021-06-16 12:54:02 -07:00
smc_tracepoint.c	net/smc: Introduce tracepoint for smcr link down	2021-11-01 13:39:14 +00:00
smc_tracepoint.h	net/smc: Add net namespace for tracepoints	2022-01-02 12:07:39 +00:00
smc_tx.c	net/smc: Introduce tracepoints for tx and rx msg	2021-11-01 13:39:14 +00:00
smc_tx.h	net/smc: eliminate cursor read and write calls	2018-07-23 10:57:14 -07:00
smc_wr.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-12-30 12:12:12 -08:00
smc_wr.h	net/smc: Remove unused function declaration	2022-01-15 22:57:21 +00:00
smc.h	net/smc: Forward wakeup to smc socket waitqueue after fallback	2022-01-31 11:07:13 +00:00