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mptcp: free resources when the port number is mismatched

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When the port number is mismatched with the announced ones, use
'goto dispose_child' to free the resources instead of using 'goto out'.

This patch also moves the port number checking code in
subflow_syn_recv_sock before mptcp_finish_join, otherwise subflow_drop_ctx
will fail in dispose_child.

Fixes: 5bc56388c7 ("mptcp: add port number check for MP_JOIN")
Reported-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2021-03-04 13:32:16 -08:00 committed by David S. Miller
parent 417789df4a
commit 9238e900d6
1 changed files with 7 additions and 6 deletions
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13
net/mptcp/subflow.c
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@ -687,11 +687,6 @@ create_child:
/* move the msk reference ownership to the subflow */
subflow_req->msk = NULL;
ctx->conn = (struct sock *)owner;
if (!mptcp_finish_join(child))
goto dispose_child;
SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINACKRX);
tcp_rsk(req)->drop_req = true;
if (subflow_use_different_sport(owner, sk)) {
pr_debug("ack inet_sport=%d %d",
@ -699,10 +694,16 @@ create_child:
ntohs(inet_sk((struct sock *)owner)->inet_sport));
if (!mptcp_pm_sport_in_anno_list(owner, sk)) {
SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_MISMATCHPORTACKRX);
goto out;
goto dispose_child;
}
SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINPORTACKRX);
}
if (!mptcp_finish_join(child))
goto dispose_child;
SUBFLOW_REQ_INC_STATS(req, MPTCP_MIB_JOINACKRX);
tcp_rsk(req)->drop_req = true;
}
}