From ee239d9901c13040598f6c46d5017869c6d14e2e Mon Sep 17 00:00:00 2001 From: Tilman Schmidt Date: Tue, 6 Oct 2009 12:18:31 +0000 Subject: 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 Signed-off-by: David S. Miller --- drivers/isdn/gigaset/i4l.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/isdn/gigaset/i4l.c') diff --git a/drivers/isdn/gigaset/i4l.c b/drivers/isdn/gigaset/i4l.c index 9b22f9cf2f33..322f16ebc6ec 100644 --- a/drivers/isdn/gigaset/i4l.c +++ b/drivers/isdn/gigaset/i4l.c @@ -51,6 +51,12 @@ static int writebuf_from_LL(int driverID, int channel, int ack, return -ENODEV; } bcs = &cs->bcs[channel]; + + /* can only handle linear sk_buffs */ + if (skb_linearize(skb) < 0) { + dev_err(cs->dev, "%s: skb_linearize failed\n", __func__); + return -ENOMEM; + } len = skb->len; gig_dbg(DEBUG_LLDATA, -- cgit v1.2.3