netdev - [PATCH net] net: ethernet: cadence: fix socket buffer corruption problem

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Message-ID: <1540417883-8476-1-git-send-email-Tristram.Ha@microchip.com>
Date:   Wed, 24 Oct 2018 14:51:23 -0700
From:   <Tristram.Ha@...rochip.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
CC:     Tristram Ha <Tristram.Ha@...rochip.com>,
        <UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>
Subject: [PATCH net] net: ethernet: cadence: fix socket buffer corruption problem

From: Tristram Ha <Tristram.Ha@...rochip.com>

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

Signed-off-by: Tristram Ha <Tristram.Ha@...rochip.com>
---
 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 8f5bf91..1d86b4d 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1684,7 +1684,7 @@ 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;
-- 
1.9.1