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We need to ensure there is enough headroom to push extra header, but we also need to check if we are allowed to change headers. skb_cow_head() is the proper helper to deal with this. Fixes Ethernet<->WiFi bridge for Raspberry Pi and probably other devices. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From d532c1082f68176363ed766d09bf187616e282fe 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 09:59:23 -0700
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Subject: [PATCH] sr9700: 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: c9b37458e956 ("USB2NET : SR9700 : One chip USB 1.1 USB2NET SR9700Device Driver Support")
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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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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/usb/sr9700.c | 9 ++-------
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1 file changed, 2 insertions(+), 7 deletions(-)
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--- a/drivers/net/usb/sr9700.c
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+++ b/drivers/net/usb/sr9700.c
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@@ -456,14 +456,9 @@ static struct sk_buff *sr9700_tx_fixup(s
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len = skb->len;
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- if (skb_headroom(skb) < SR_TX_OVERHEAD) {
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- struct sk_buff *skb2;
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-
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- skb2 = skb_copy_expand(skb, SR_TX_OVERHEAD, 0, flags);
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+ if (skb_cow_head(skb, SR_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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__skb_push(skb, SR_TX_OVERHEAD);
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