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linux/net/smc
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Eric Dumazet d293958a85 net/smc: do not leave a dangling sk pointer in __smc_create() 
Thanks to commit 4bbd360a50 ("socket: Print pf->create() when
it does not clear sock->sk on failure."), syzbot found an issue with AF_SMC:

smc_create must clear sock->sk on failure, family: 43, type: 1, protocol: 0
 WARNING: CPU: 0 PID: 5827 at net/socket.c:1565 __sock_create+0x96f/0xa30 net/socket.c:1563
Modules linked in:
CPU: 0 UID: 0 PID: 5827 Comm: syz-executor259 Not tainted 6.12.0-rc6-next-20241106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
 RIP: 0010:__sock_create+0x96f/0xa30 net/socket.c:1563
Code: 03 00 74 08 4c 89 e7 e8 4f 3b 85 f8 49 8b 34 24 48 c7 c7 40 89 0c 8d 8b 54 24 04 8b 4c 24 0c 44 8b 44 24 08 e8 32 78 db f7 90 <0f> 0b 90 90 e9 d3 fd ff ff 89 e9 80 e1 07 fe c1 38 c1 0f 8c ee f7
RSP: 0018:ffffc90003e4fda0 EFLAGS: 00010246
RAX: 099c6f938c7f4700 RBX: 1ffffffff1a595fd RCX: ffff888034823c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000ffffffe9 R08: ffffffff81567052 R09: 1ffff920007c9f50
R10: dffffc0000000000 R11: fffff520007c9f51 R12: ffffffff8d2cafe8
R13: 1ffffffff1a595fe R14: ffffffff9a789c40 R15: ffff8880764298c0
FS:  000055557b518380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa62ff43225 CR3: 0000000031628000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
  sock_create net/socket.c:1616 [inline]
  __sys_socket_create net/socket.c:1653 [inline]
  __sys_socket+0x150/0x3c0 net/socket.c:1700
  __do_sys_socket net/socket.c:1714 [inline]
  __se_sys_socket net/socket.c:1712 [inline]

For reference, see commit 2d859aff77 ("Merge branch
'do-not-leave-dangling-sk-pointers-in-pf-create-functions'")

Fixes: d25a92ccae ("net/smc: Introduce IPPROTO_SMC")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ignat Korchagin <ignat@cloudflare.com>
Cc: D. Wythe <alibuda@linux.alibaba.com>
Cc: Dust Li <dust.li@linux.alibaba.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Link: https://patch.msgid.link/20241106221922.1544045-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-11-07 11:31:14 -08:00
..
af_smc.c net/smc: do not leave a dangling sk pointer in __smc_create() 2024-11-07 11:31:14 -08:00
Kconfig net/smc: introduce loopback-ism for SMC intra-OS shortcut 2024-04-30 13:24:48 +02:00
Makefile net/smc: Introduce IPPROTO_SMC 2024-06-17 13:14:09 +01:00
smc_cdc.c net/smc: adapt cursor update when sndbuf and peer DMB are merged 2024-04-30 13:24:48 +02:00
smc_cdc.h
smc_clc.c net/smc: Avoid -Wflex-array-member-not-at-end warnings 2024-04-03 11:01:30 +01:00
smc_clc.h net/smc: Use static_assert() to check struct sizes 2024-08-12 18:41:42 -07:00
smc_close.c net/smc: put sk reference if close work was canceled 2023-11-06 10:01:07 +00:00
smc_close.h
smc_core.c net/smc: introduce statistics for ringbufs usage of net namespace 2024-08-20 11:38:23 +02:00
smc_core.h net/smc: introduce statistics for allocated ringbufs of link group 2024-08-20 11:38:23 +02:00
smc_diag.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-01-25 14:20:08 -08:00
smc_ib.c net/smc: Fix lookup of netdev by using ib_device_get_netdev() 2024-11-07 11:24:19 -08:00
smc_ib.h
smc_inet.c net/smc: fix lacks of icsk_syn_mss with IPPROTO_SMC 2024-10-10 08:48:11 -07:00
smc_inet.h net/smc: Introduce IPPROTO_SMC 2024-06-17 13:14:09 +01:00
smc_ism.c net/smc: add operations to merge sndbuf with peer DMB 2024-04-30 13:24:48 +02:00
smc_ism.h net/smc: add operations to merge sndbuf with peer DMB 2024-04-30 13:24:48 +02:00
smc_llc.c
smc_llc.h
smc_loopback.c net/smc: implement DMB-merged operations of loopback-ism 2024-04-30 13:24:49 +02:00
smc_loopback.h net/smc: remove unreferenced header in smc_loopback.h file 2024-07-31 11:48:58 +01:00
smc_netlink.c
smc_netlink.h
smc_netns.h
smc_pnet.c net/smc: Fix lookup of netdev by using ib_device_get_netdev() 2024-11-07 11:24:19 -08:00
smc_pnet.h
smc_rx.c net: add sk_wake_async_rcu() helper 2024-03-29 15:03:11 -07:00
smc_rx.h
smc_stats.c net/smc: introduce statistics for ringbufs usage of net namespace 2024-08-20 11:38:23 +02:00
smc_stats.h net/smc: introduce statistics for ringbufs usage of net namespace 2024-08-20 11:38:23 +02:00
smc_sysctl.c net/smc: add sysctl for smc_limit_hs 2024-09-10 12:11:04 +02:00
smc_sysctl.h net/smc: add sysctl for max conns per lgr for SMC-R v2.1 2023-11-24 12:13:14 +00:00
smc_tracepoint.c
smc_tracepoint.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
smc_tx.c net/smc: remove unneeded atomic operations in smc_tx_sndbuf_nonempty 2023-11-24 15:00:47 +00:00
smc_tx.h
smc_wr.c net/smc: Fix memory leak when using percpu refs 2024-10-14 17:32:05 -07:00
smc_wr.h
smc.h net/smc: prevent NULL pointer dereference in txopt_get 2024-08-30 13:26:12 +01:00