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l2tp: fix l2tp_session_register with colliding l2tpv3 IDs
When handling colliding L2TPv3 session IDs, we use the existing
session IDR entry and link the new session on that using
session->coll_list. However, when using an existing IDR entry, we must
not do the idr_replace step.
Fixes: aa5e17e1f5
("l2tp: store l2tpv3 sessions in per-net IDR")
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
b6c6796789
commit
2146b7dd35
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@ -436,6 +436,7 @@ int l2tp_session_register(struct l2tp_session *session,
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struct l2tp_tunnel *tunnel)
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{
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struct l2tp_net *pn = l2tp_pernet(tunnel->l2tp_net);
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struct l2tp_session *other_session = NULL;
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u32 session_key;
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int err;
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@ -456,11 +457,10 @@ int l2tp_session_register(struct l2tp_session *session,
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* support existing userspace which depends on it.
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*/
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if (err == -ENOSPC && tunnel->encap == L2TP_ENCAPTYPE_UDP) {
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struct l2tp_session *session2;
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session2 = idr_find(&pn->l2tp_v3_session_idr,
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session_key);
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err = l2tp_session_collision_add(pn, session, session2);
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other_session = idr_find(&pn->l2tp_v3_session_idr,
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session_key);
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err = l2tp_session_collision_add(pn, session,
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other_session);
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}
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spin_unlock_bh(&pn->l2tp_session_idr_lock);
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} else {
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@ -484,10 +484,12 @@ int l2tp_session_register(struct l2tp_session *session,
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spin_unlock_bh(&tunnel->list_lock);
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spin_lock_bh(&pn->l2tp_session_idr_lock);
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if (tunnel->version == L2TP_HDR_VER_3)
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idr_replace(&pn->l2tp_v3_session_idr, session, session_key);
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else
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if (tunnel->version == L2TP_HDR_VER_3) {
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if (!other_session)
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idr_replace(&pn->l2tp_v3_session_idr, session, session_key);
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} else {
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idr_replace(&pn->l2tp_v2_session_idr, session, session_key);
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}
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spin_unlock_bh(&pn->l2tp_session_idr_lock);
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trace_register_session(session);
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