linux-kernel - [PATCH 3.16 37/83] sctp: fix the transport error

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Message-ID: <lsq.1574264230.971583478@decadent.org.uk>
Date:   Wed, 20 Nov 2019 15:37:47 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Marcelo Ricardo Leitner" <marcelo.leitner@...il.com>,
        "Xin Long" <lucien.xin@...il.com>,
        "Jakub Kicinski" <jakub.kicinski@...ronome.com>
Subject: [PATCH 3.16 37/83] sctp: fix the transport error_count check

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Xin Long <lucien.xin@...il.com>

commit a1794de8b92ea6bc2037f445b296814ac826693e upstream.

As the annotation says in sctp_do_8_2_transport_strike():

  "If the transport error count is greater than the pf_retrans
   threshold, and less than pathmaxrtx ..."

It should be transport->error_count checked with pathmaxrxt,
instead of asoc->pf_retrans.

Fixes: 5aa93bcf66f4 ("sctp: Implement quick failover draft from tsvwg")
Signed-off-by: Xin Long <lucien.xin@...il.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/sctp/sm_sideeffect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -504,7 +504,7 @@ static void sctp_do_8_2_transport_strike
 	 * see SCTP Quick Failover Draft, section 5.1
 	 */
 	if ((transport->state == SCTP_ACTIVE) &&
-	   (asoc->pf_retrans < transport->pathmaxrxt) &&
+	   (transport->error_count < transport->pathmaxrxt) &&
 	   (transport->error_count > asoc->pf_retrans)) {
 
 		sctp_assoc_control_transport(asoc, transport,