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39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
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From d4ca73591916b760478d2b04334d5dcadc028e9c Mon Sep 17 00:00:00 2001
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From: Eric Dumazet <edumazet@google.com>
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Date: Wed, 19 Apr 2017 09:59:24 -0700
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Subject: [PATCH] lan78xx: use skb_cow_head() to deal with cloned skbs
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We need to ensure there is enough headroom to push extra header,
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but we also need to check if we are allowed to change headers.
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skb_cow_head() is the proper helper to deal with this.
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Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
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Signed-off-by: Eric Dumazet <edumazet@google.com>
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Cc: James Hughes <james.hughes@raspberrypi.org>
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Cc: Woojung Huh <woojung.huh@microchip.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/usb/lan78xx.c | 9 ++-------
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1 file changed, 2 insertions(+), 7 deletions(-)
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--- a/drivers/net/usb/lan78xx.c
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+++ b/drivers/net/usb/lan78xx.c
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@@ -2050,14 +2050,9 @@ static struct sk_buff *lan78xx_tx_prep(s
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{
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u32 tx_cmd_a, tx_cmd_b;
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- if (skb_headroom(skb) < TX_OVERHEAD) {
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- struct sk_buff *skb2;
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-
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- skb2 = skb_copy_expand(skb, TX_OVERHEAD, 0, flags);
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+ if (skb_cow_head(skb, TX_OVERHEAD)) {
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dev_kfree_skb_any(skb);
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- skb = skb2;
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- if (!skb)
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- return NULL;
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+ return NULL;
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}
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if (lan78xx_linearize(skb) < 0)
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