linux-kernel - [PATCH 4.19 05/48] fq_codel: fix TCA_FQ_CODEL_DROP_BATCH

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Message-Id: <20200513094353.047593779@linuxfoundation.org>
Date:   Wed, 13 May 2020 11:44:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 05/48] fq_codel: fix TCA_FQ_CODEL_DROP_BATCH_SIZE sanity checks

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 14695212d4cd8b0c997f6121b6df8520038ce076 ]

My intent was to not let users set a zero drop_batch_size,
it seems I once again messed with min()/max().

Fixes: 9d18562a2278 ("fq_codel: add batch ability to fq_codel_drop()")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/sch_fq_codel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -429,7 +429,7 @@ static int fq_codel_change(struct Qdisc
 		q->quantum = max(256U, nla_get_u32(tb[TCA_FQ_CODEL_QUANTUM]));
 
 	if (tb[TCA_FQ_CODEL_DROP_BATCH_SIZE])
-		q->drop_batch_size = min(1U, nla_get_u32(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]));
+		q->drop_batch_size = max(1U, nla_get_u32(tb[TCA_FQ_CODEL_DROP_BATCH_SIZE]));
 
 	if (tb[TCA_FQ_CODEL_MEMORY_LIMIT])
 		q->memory_limit = min(1U << 31, nla_get_u32(tb[TCA_FQ_CODEL_MEMORY_LIMIT]));