Patch "tcp_metrics: properly set tp->snd_ssthresh in tcp_init_metrics()" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    tcp_metrics: properly set tp->snd_ssthresh in tcp_init_metrics()

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tcp_metrics-properly-set-tp-snd_ssthresh-in-tcp_init.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a1a03810a304e8246749ccb9980b44570c35578f
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date:   Fri Sep 22 22:03:54 2023 +0000

    tcp_metrics: properly set tp->snd_ssthresh in tcp_init_metrics()
    
    [ Upstream commit 081480014a64a69d901f8ef1ffdd56d6085cf87e ]
    
    We need to set tp->snd_ssthresh to TCP_INFINITE_SSTHRESH
    in the case tcp_get_metrics() fails for some reason.
    
    Fixes: 9ad7c049f0f7 ("tcp: RFC2988bis + taking RTT sample from 3WHS for the passive open side")
    Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
    Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
    Acked-by: Neal Cardwell <ncardwell@xxxxxxxxxx>
    Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 61c573a72db63..5a08dc46a1130 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -470,6 +470,10 @@ void tcp_init_metrics(struct sock *sk)
 	u32 val, crtt = 0; /* cached RTT scaled by 8 */
 
 	sk_dst_confirm(sk);
+	/* ssthresh may have been reduced unnecessarily during.
+	 * 3WHS. Restore it back to its initial default.
+	 */
+	tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	if (!dst)
 		goto reset;
 
@@ -489,11 +493,6 @@ void tcp_init_metrics(struct sock *sk)
 		tp->snd_ssthresh = val;
 		if (tp->snd_ssthresh > tp->snd_cwnd_clamp)
 			tp->snd_ssthresh = tp->snd_cwnd_clamp;
-	} else {
-		/* ssthresh may have been reduced unnecessarily during.
-		 * 3WHS. Restore it back to its initial default.
-		 */
-		tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
 	}
 	val = tcp_metric_get(tm, TCP_METRIC_REORDERING);
 	if (val && tp->reordering != val)



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