From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jiasheng Jiang <jiasheng@iscas.ac.cn>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 191/355] rxrpc: Fix _usecs_to_jiffies() by using usecs_to_jiffies()
Date:   Mon, 15 Nov 2021 18:01:55 +0100
Message-Id: <20211115165319.945636119@linuxfoundation.org>
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From: Jiasheng Jiang <jiasheng@iscas.ac.cn>

[ Upstream commit acde891c243c1ed85b19d4d5042bdf00914f5739 ]

Directly using _usecs_to_jiffies() might be unsafe, so it's
better to use usecs_to_jiffies() instead.
Because we can see that the result of _usecs_to_jiffies()
could be larger than MAX_JIFFY_OFFSET values without the
check of the input.

Fixes: c410bf01933e ("Fix the excessive initial retransmission timeout")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/rxrpc/rtt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/rxrpc/rtt.c b/net/rxrpc/rtt.c
index 928d8b34a3eee..f3f87c9f0209d 100644
--- a/net/rxrpc/rtt.c
+++ b/net/rxrpc/rtt.c
@@ -23,7 +23,7 @@ static u32 rxrpc_rto_min_us(struct rxrpc_peer *peer)
 
 static u32 __rxrpc_set_rto(const struct rxrpc_peer *peer)
 {
-	return _usecs_to_jiffies((peer->srtt_us >> 3) + peer->rttvar_us);
+	return usecs_to_jiffies((peer->srtt_us >> 3) + peer->rttvar_us);
 }
 
 static u32 rxrpc_bound_rto(u32 rto)
-- 
2.33.0