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mptcp: syncookies: remember the request backup flag

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Instead of using an uninitialised bit when copying the info in
subflow_ulp_clone().

To fix this, no need to extend the join_entry structure: backup is
coming from struct mptcp_subflow_request_sock, only one bit. Do the same
here by using one bit for both.

Fixes: efd340bf3d ("mptcp: distinguish rcv vs sent backup flag in requests")
Cc: stable@vger.kernel.org
Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260908-net-mptcp-misc-fixes-7-3-rc1-v2-3-df1de70348b6@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0) 2026-09-08 16:07:08 +02:00 committed by Jakub Kicinski
parent 29f641951b
commit b76c0e28b3
1 changed files with 4 additions and 1 deletions
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5
net/mptcp/syncookies.c
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@ -26,7 +26,8 @@ struct join_entry {
u32 local_nonce;
u8 join_id;
u8 local_id;
u8 backup;
u8 backup:1,
request_bkup:1;
u8 valid;
};
@ -63,6 +64,7 @@ static void mptcp_join_store_state(struct join_entry *entry,
entry->remote_nonce = subflow_req->remote_nonce;
entry->local_nonce = subflow_req->local_nonce;
entry->backup = subflow_req->backup;
entry->request_bkup = subflow_req->request_bkup;
entry->join_id = subflow_req->remote_id;
entry->local_id = subflow_req->local_id;
entry->valid = 1;
@ -117,6 +119,7 @@ bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subfl
subflow_req->remote_nonce = e->remote_nonce;
subflow_req->local_nonce = e->local_nonce;
subflow_req->backup = e->backup;
subflow_req->request_bkup = e->request_bkup;
subflow_req->remote_id = e->join_id;
subflow_req->local_id = e->local_id;
subflow_req->token = e->token;