diff options
| author | Paolo Abeni <pabeni@redhat.com> | 2020-08-03 18:40:39 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-08-03 18:14:20 -0700 |
| commit | 8555c6bfd5fddb1cf363d3cd157d70a1bb27f718 (patch) | |
| tree | 82945fabfd5072f5fef867a20be5a0dd49f549e0 /net | |
| parent | f8deaea06fb5002a9ebb7a366ef4066e2d7e0944 (diff) | |
mptcp: fix bogus sendmsg() return code under pressure
In case of memory pressure, mptcp_sendmsg() may call
sk_stream_wait_memory() after succesfully xmitting some
bytes. If the latter fails we currently return to the
user-space the error code, ignoring the succeful xmit.
Address the issue always checking for the xmitted bytes
before mptcp_sendmsg() completes.
Fixes: f296234c98a8 ("mptcp: Add handling of incoming MP_JOIN requests")
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mptcp/protocol.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 400824eabf73..8c1d1a595701 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -984,7 +984,6 @@ wait_for_sndbuf: mptcp_set_timeout(sk, ssk); if (copied) { - ret = copied; tcp_push(ssk, msg->msg_flags, mss_now, tcp_sk(ssk)->nonagle, size_goal); @@ -997,7 +996,7 @@ wait_for_sndbuf: release_sock(ssk); out: release_sock(sk); - return ret; + return copied ? : ret; } static void mptcp_wait_data(struct sock *sk, long *timeo) |