diff options
| author | Matthieu Baerts <matthieu.baerts@tessares.net> | 2022-01-07 01:06:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 13:03:59 +0300 |
| commit | 72aba03ba836c7b72b29cbec1c8ddc61b57edada (patch) | |
| tree | 27f0d5b74928e70284ff606605096555794c3ed3 /net | |
| parent | c310df0eabe5667028c2979d93a31a52cf33d0f2 (diff) | |
| download | linux-72aba03ba836c7b72b29cbec1c8ddc61b57edada.tar.xz | |
mptcp: fix opt size when sending DSS + MP_FAIL
[ Upstream commit 04fac2cae9422a3401c172571afbcfdd58fa5c7e ]
When these two options had to be sent -- which is not common -- the DSS
size was not being taken into account in the remaining size.
Additionally in this situation, the reported size was only the one of
the MP_FAIL which can cause issue if at the end, we need to write more
in the TCP options than previously said.
Here we use a dedicated variable for MP_FAIL size to keep the
WARN_ON_ONCE() just after.
Fixes: c25aeb4e0953 ("mptcp: MP_FAIL suboption sending")
Acked-and-tested-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mptcp/options.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 0966855a7c25..f69a1cadb13f 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -823,10 +823,13 @@ bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, if (mptcp_established_options_mp(sk, skb, snd_data_fin, &opt_size, remaining, opts)) ret = true; else if (mptcp_established_options_dss(sk, skb, snd_data_fin, &opt_size, remaining, opts)) { + unsigned int mp_fail_size; + ret = true; - if (mptcp_established_options_mp_fail(sk, &opt_size, remaining, opts)) { - *size += opt_size; - remaining -= opt_size; + if (mptcp_established_options_mp_fail(sk, &mp_fail_size, + remaining - opt_size, opts)) { + *size += opt_size + mp_fail_size; + remaining -= opt_size - mp_fail_size; return true; } } |