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List:       linux-sctp
Subject:    [PATCH net 4/4] sctp: return true only for pathmtu update in sctp_transport_pl_toobig
From:       Xin Long <lucien.xin () gmail ! com>
Date:       2021-10-28 9:36:04
Message-ID: 81d365e3186a0ad69dadf5c316637696b64c7f1d.1635413715.git.lucien.xin () gmail ! com
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sctp_transport_pl_toobig() supposes to return true only if there's
pathmtu update, so that in sctp_icmp_frag_needed() it would call
sctp_assoc_sync_pmtu() and sctp_retransmit(). This patch is to fix
these return places in sctp_transport_pl_toobig().

Fixes: 836964083177 ("sctp: do state transition when receiving an icmp TOOBIG packet")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 net/sctp/transport.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 1f2dfad768d5..133f1719bf1b 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -368,6 +368,7 @@ static bool sctp_transport_pl_toobig(struct sctp_transport *t, u32 pmtu)
 
 			t->pl.pmtu = SCTP_BASE_PLPMTU;
 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+			return true;
 		}
 	} else if (t->pl.state == SCTP_PL_SEARCH) {
 		if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {
@@ -378,11 +379,10 @@ static bool sctp_transport_pl_toobig(struct sctp_transport *t, u32 pmtu)
 			t->pl.probe_high = 0;
 			t->pl.pmtu = SCTP_BASE_PLPMTU;
 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+			return true;
 		} else if (pmtu > t->pl.pmtu && pmtu < t->pl.probe_size) {
 			t->pl.probe_size = pmtu;
 			t->pl.probe_count = 0;
-
-			return false;
 		}
 	} else if (t->pl.state == SCTP_PL_COMPLETE) {
 		if (pmtu >= SCTP_BASE_PLPMTU && pmtu < t->pl.pmtu) {
@@ -393,10 +393,11 @@ static bool sctp_transport_pl_toobig(struct sctp_transport *t, u32 pmtu)
 			t->pl.probe_high = 0;
 			t->pl.pmtu = SCTP_BASE_PLPMTU;
 			t->pathmtu = t->pl.pmtu + sctp_transport_pl_hlen(t);
+			return true;
 		}
 	}
 
-	return true;
+	return false;
 }
 
 bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
-- 
2.27.0

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