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38 lines
1.2 KiB
38 lines
1.2 KiB
From 6bc6895bdd6744e0136eaa4a11fbdb20a7db4e40 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 09:59:25 -0700
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Subject: [PATCH] ch9200: 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: 4a476bd6d1d9 ("usbnet: New driver for QinHeng CH9200 devices")
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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: Matthew Garrett <mjg59@srcf.ucam.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/ch9200.c | 9 ++-------
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1 file changed, 2 insertions(+), 7 deletions(-)
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--- a/drivers/net/usb/ch9200.c
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+++ b/drivers/net/usb/ch9200.c
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@@ -255,14 +255,9 @@ static struct sk_buff *ch9200_tx_fixup(s
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tx_overhead = 0x40;
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len = skb->len;
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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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__skb_push(skb, tx_overhead);
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