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authorPaolo Abeni <pabeni@redhat.com>2020-04-22 18:24:56 +0200
committerDavid S. Miller <davem@davemloft.net>2020-04-22 19:46:01 -0700
commit9a19371bf029d784aa37ee623ce175205f43ccfd (patch)
tree20d71875e6cca8f3add442d99011d507719ed40a /net/mptcp/options.c
parenta53c102872ad6e34e1518e25899dc9498c27f8b1 (diff)
mptcp: fix data_fin handing in RX path
The data fin flag is set only via a DSS option, but mptcp_incoming_options() copies it unconditionally from the provided RX options. Since we do not clear all the mptcp sock RX options in a socket free/alloc cycle, we can end-up with a stray data_fin value while parsing e.g. MPC packets. That would lead to mapping data corruption and will trigger a few WARN_ON() in the RX path. Instead of adding a costly memset(), fetch the data_fin flag only for DSS packets - when we always explicitly initialize such bit at option parsing time. Fixes: 648ef4b88673 ("mptcp: Implement MPTCP receive path") Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/options.c')
-rw-r--r--net/mptcp/options.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index faf57585b892..4a7c467b99db 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -876,12 +876,11 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
mpext->data_seq = mp_opt->data_seq;
mpext->subflow_seq = mp_opt->subflow_seq;
mpext->dsn64 = mp_opt->dsn64;
+ mpext->data_fin = mp_opt->data_fin;
}
mpext->data_len = mp_opt->data_len;
mpext->use_map = 1;
}
-
- mpext->data_fin = mp_opt->data_fin;
}
void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts)