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Message-ID: <20090906-patch-gigaset-03.tilman@imap.cc>
Date: Sun, 6 Sep 2009 20:58:52 +0200 (CEST)
From: Tilman Schmidt <tilman@...p.cc>
To: davem@...emloft.net, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, i4ldeveloper@...tserv.isdn4linux.de
CC: Hansjoerg Lipp <hjlipp@....de>
Subject: [PATCH 03/12] 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@...p.cc>
---
drivers/isdn/gigaset/i4l.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/isdn/gigaset/i4l.c b/drivers/isdn/gigaset/i4l.c
index 9b22f9c..322f16e 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,
--
1.6.2.1.214.ge986c
--
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