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batman-adv: tp_meter: handle seqno wrap-around for fast recovery detection

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commit f54c85ed42 upstream.

The recover variable and the last_sent sequence number are initialized on
purpose as a really high value which will wrap-around after the first 2000
bytes. The fast recovery precondition must therefore not use simple integer
comparisons but use helpers which are aware of the sequence number
wrap-arounds.

Cc: stable@kernel.org
Fixes: 33a3bb4a33 ("batman-adv: throughput meter implementation")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sven Eckelmann
2026-07-04 13:41:30 +02:00
committed by Greg Kroah-Hartman
parent 6342b1b539
commit cb01fe90e8
1 changed files with 1 additions and 1 deletions
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net/batman-adv/tp_meter.c
+1 -1
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@@ -733,7 +733,7 @@ static void batadv_tp_recv_ack(struct batadv_priv *bat_priv,
if (atomic_read(&tp_vars->dup_acks) != 3)
goto out;
if (tp_vars->recover >= recv_ack)
if (!batadv_seq_before(tp_vars->recover, recv_ack))
goto out;
/* if this is the third duplicate ACK do Fast Retransmit */