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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tristram Ha <Tristram.Ha@microchip.com>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 141/306] net: ethernet: cadence: fix socket buffer corruption problem
Date:   Wed, 27 Nov 2019 21:29:51 +0100
Message-Id: <20191127203125.628204748@linuxfoundation.org>
In-Reply-To: <20191127203114.766709977@linuxfoundation.org>
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From: Tristram Ha <Tristram.Ha@microchip.com>

[ Upstream commit 899ecaedd15599c22553d158f53b127cc1632dc2 ]

Socket buffer is not re-created when headroom is 2 and tailroom is 1.

Signed-off-by: Tristram Ha <Tristram.Ha@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/cadence/macb_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 74eeb3a985bf1..f175b20ac510a 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1721,7 +1721,7 @@ static int macb_pad_and_fcs(struct sk_buff **skb, struct net_device *ndev)
 			padlen = 0;
 		/* No room for FCS, need to reallocate skb. */
 		else
-			padlen = ETH_FCS_LEN - tailroom;
+			padlen = ETH_FCS_LEN;
 	} else {
 		/* Add room for FCS. */
 		padlen += ETH_FCS_LEN;
-- 
2.20.1