netdev - [PATCH net] net/smc: do not leave a dangling sk pointer in __smc

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Message-ID: <20241106221922.1544045-1-edumazet@google.com>
Date: Wed,  6 Nov 2024 22:19:22 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
	Ignat Korchagin <ignat@...udflare.com>, "D. Wythe" <alibuda@...ux.alibaba.com>, 
	Wenjia Zhang <wenjia@...ux.ibm.com>, Dust Li <dust.li@...ux.alibaba.com>
Subject: [PATCH net] net/smc: do not leave a dangling sk pointer in __smc_create()

Thanks to commit 4bbd360a5084 ("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 2d859aff775d ("Merge branch
'do-not-leave-dangling-sk-pointers-in-pf-create-functions'")

Fixes: d25a92ccae6b ("net/smc: Introduce IPPROTO_SMC")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: Ignat Korchagin <ignat@...udflare.com>
Cc: D. Wythe <alibuda@...ux.alibaba.com>
Cc: Wenjia Zhang <wenjia@...ux.ibm.com>
Cc: Dust Li <dust.li@...ux.alibaba.com>
---
 net/smc/af_smc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 0316217b7687388de37e0dfe1e11fe6b4ee6b628..9d76e902fd770f5b10d9cd8ae977f1d80552066f 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -3359,8 +3359,10 @@ static int __smc_create(struct net *net, struct socket *sock, int protocol,
 	else
 		rc = smc_create_clcsk(net, sk, family);
 
-	if (rc)
+	if (rc) {
 		sk_common_release(sk);
+		sock->sk = NULL;
+	}
 out:
 	return rc;
 }
-- 
2.47.0.199.ga7371fff76-goog