Christoph reported a devide by zero bug in mptcp_recvmsg():
divide error: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 19978 Comm: syz-executor.6 Not tainted 6.4.0-rc2-gffcc7899081b #20
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014
RIP: 0010:__tcp_select_window+0x30e/0x420 net/ipv4/tcp_output.c:3018
Code: 11 ff 0f b7 cd c1 e9 0c b8 ff ff ff ff d3 e0 89 c1 f7 d1 01 cb 21 c3 eb 17 e8 2e 83 11 ff 31 db eb 0e e8 25 83 11 ff 89 d8 99 <f7> 7c 24 04 29 d3 65 48 8b 04 25 28 00 00 00 48 3b 44 24 10 75 60
RSP: 0018:ffffc90000a07a18 EFLAGS: 00010246
RAX: 000000000000ffd7 RBX: 000000000000ffd7 RCX: 0000000000040000
RDX: 0000000000000000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 000000000000ffd7 R08: ffffffff820cf297 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff8103d1a0 R12: 0000000000003f00
R13: 0000000000300000 R14: ffff888101cf3540 R15: 0000000000180000
FS: 00007f9af4c09640(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33824000 CR3: 000000012f241001 CR4: 0000000000170ee0
Call Trace:
<TASK>
__tcp_cleanup_rbuf+0x138/0x1d0 net/ipv4/tcp.c:1611
mptcp_recvmsg+0xcb8/0xdd0 net/mptcp/protocol.c:2034
inet_recvmsg+0x127/0x1f0 net/ipv4/af_inet.c:861
____sys_recvmsg+0x269/0x2b0 net/socket.c:1019
___sys_recvmsg+0xe6/0x260 net/socket.c:2764
do_recvmmsg+0x1a5/0x470 net/socket.c:2858
__do_sys_recvmmsg net/socket.c:2937 [inline]
__se_sys_recvmmsg net/socket.c:2953 [inline]
__x64_sys_recvmmsg+0xa6/0x130 net/socket.c:2953
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x47/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7f9af58fc6a9
Code: 5c c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 4f 37 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007f9af4c08cd8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00000000006bc050 RCX: 00007f9af58fc6a9
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000f00 R11: 0000000000000246 R12: 00000000006bc05c
R13: fffffffffffffea8 R14: 00000000006bc050 R15: 000000000001fe40
</TASK>
mptcp_recvmsg is allowed to release the msk socket lock when
blocking, and before re-acquiring it another thread could have
switched the sock to TCP_LISTEN status - with a prior
connect(AF_UNSPEC) - also clearing icsk_ack.rcv_mss.
Address the issue explicitly checking again the sock status
after re-acquiring the lock.
Fixes: a6b118febbab ("mptcp: add receive buffer auto-tuning")
Reported-by: Christoph Paasch <cpaasch@apple.com>
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/404
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
net/mptcp/protocol.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index d8e152a8619a..ede6b4c7641e 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2228,6 +2228,10 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
pr_debug("block timeout %ld", timeo);
sk_wait_data(sk, &timeo, NULL);
+ if (unlikely(sk->sk_state == TCP_LISTEN)) {
+ copied = copied ? : -ENOTCONN;
+ goto out_release;
+ }
}
out_err:
@@ -2248,6 +2252,7 @@ static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
if (!(flags & MSG_PEEK))
mptcp_rcv_space_adjust(msk, copied);
+out_release:
release_sock(sk);
return copied;
}
--
2.40.1