gigaset: linearize skb
The code of the Gigaset driver assumes that sk_buff-s coming from the ISDN4Linux subsystem are always linear. Explicitly calling skb_linearize() is cheap if they are, but much more robust in case they ever aren't. Impact: robustness improvement Signed-off-by: Tilman Schmidt <tilman@imap.cc> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -51,6 +51,12 @@ static int writebuf_from_LL(int driverID, int channel, int ack,
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return -ENODEV;
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}
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bcs = &cs->bcs[channel];
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/* can only handle linear sk_buffs */
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if (skb_linearize(skb) < 0) {
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dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
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return -ENOMEM;
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}
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len = skb->len;
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gig_dbg(DEBUG_LLDATA,
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