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    Subject[PATCH 4.9 28/96] smsc75xx: use skb_cow_head() to deal with cloned skbs
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Eric Dumazet <edumazet@google.com>

    commit b7c6d2675899cfff0180412c63fc9cbd5bacdb4d upstream.

    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: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver")
    Signed-off-by: Eric Dumazet <edumazet@google.com>
    Cc: James Hughes <james.hughes@raspberrypi.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Oliver Neukum <oneukum@suse.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/net/usb/smsc75xx.c | 8 ++------
    1 file changed, 2 insertions(+), 6 deletions(-)

    --- a/drivers/net/usb/smsc75xx.c
    +++ b/drivers/net/usb/smsc75xx.c
    @@ -2205,13 +2205,9 @@ static struct sk_buff *smsc75xx_tx_fixup
    {
    u32 tx_cmd_a, tx_cmd_b;

    - if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) {
    - struct sk_buff *skb2 =
    - skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags);
    + if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) {
    dev_kfree_skb_any(skb);
    - skb = skb2;
    - if (!skb)
    - return NULL;
    + return NULL;
    }

    tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;

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