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789b6cc2a5
linux/net/smc
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Dust Li 789b6cc2a5 net/smc: fix wrong list_del in smc_lgr_cleanup_early 
smc_lgr_cleanup_early() meant to delete the link
group from the link group list, but it deleted
the list head by mistake.

This may cause memory corruption since we didn't
remove the real link group from the list and later
memseted the link group structure.
We got a list corruption panic when testing:

[  231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000
[  231.278222] ------------[ cut here ]------------
[  231.278726] kernel BUG at lib/list_debug.c:53!
[  231.279326] invalid opcode: 0000 [#1] SMP NOPTI
[  231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435
[  231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014
[  231.281248] Workqueue: events smc_link_down_work
[  231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90
[  231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c7 c7 88 4c
60 82 e8 6c cc 6a 00 0f 0b 48 89 fe 48 c7 c7 c0 4c 60 82 e8 5b cc 6a 00 <0f>
0b 48 89 fe 48 c7 c7 00 4d 60 82 e8 4a cc 6a 00 0f 0b cc cc cc
[  231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292
[  231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000
[  231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040
[  231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001
[  231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001
[  231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003
[  231.288337] FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
[  231.289160] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0
[  231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  231.291940] Call Trace:
[  231.292211]  smc_lgr_terminate_sched+0x53/0xa0
[  231.292677]  smc_switch_conns+0x75/0x6b0
[  231.293085]  ? update_load_avg+0x1a6/0x590
[  231.293517]  ? ttwu_do_wakeup+0x17/0x150
[  231.293907]  ? update_load_avg+0x1a6/0x590
[  231.294317]  ? newidle_balance+0xca/0x3d0
[  231.294716]  smcr_link_down+0x50/0x1a0
[  231.295090]  ? __wake_up_common_lock+0x77/0x90
[  231.295534]  smc_link_down_work+0x46/0x60
[  231.295933]  process_one_work+0x18b/0x350

Fixes: a0a62ee15a ("net/smc: separate locks for SMCD and SMCR link group lists")
Signed-off-by: Dust Li <dust.li@linux.alibaba.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-12-02 12:07:46 +00:00
..
af_smc.c net/smc: Don't call clcsock shutdown twice when smc shutdown 2021-11-26 11:23:35 -08:00
Kconfig
Makefile net/smc: Introduce tracepoint for fallback 2021-11-01 13:39:14 +00:00
smc_cdc.c net/smc: improved fix wait on already cleared link 2021-10-08 17:00:16 +01:00
smc_cdc.h
smc_clc.c net/smc: add v2 format of CLC decline message 2021-10-16 14:58:13 +01:00
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: Ensure the active closing peer first closes clcsock 2021-11-23 11:42:24 +00:00
smc_close.h
smc_core.c net/smc: fix wrong list_del in smc_lgr_cleanup_early 2021-12-02 12:07:46 +00:00
smc_core.h net/smc: extend LLC layer for SMC-Rv2 2021-10-16 14:58:13 +01:00
smc_diag.c net/smc: Introduce SMCR get link command 2020-12-01 17:56:13 -08:00
smc_ib.c net/smc: stop links when their GID is removed 2021-10-16 14:58:13 +01:00
smc_ib.h net/smc: retrieve v2 gid from IB device 2021-10-16 14:58:13 +01:00
smc_ism.c net/smc: keep static copy of system EID 2021-09-14 12:49:10 +01:00
smc_ism.h net/smc: keep static copy of system EID 2021-09-14 12:49:10 +01:00
smc_llc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
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: retrieve v2 gid from IB device 2021-10-16 14:58:13 +01:00
smc_pnet.h net/smc: determine proposed ISM devices 2020-09-28 15:19:03 -07:00
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: Print function name in smcr_link_down tracepoint 2021-11-05 10:14:38 +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
smc_wr.c net/smc: extend LLC layer for SMC-Rv2 2021-10-16 14:58:13 +01:00
smc_wr.h net/smc: extend LLC layer for SMC-Rv2 2021-10-16 14:58:13 +01:00
smc.h net/smc: extend LLC layer for SMC-Rv2 2021-10-16 14:58:13 +01:00