netdev - Re: [PATCH] net/ieee802154/6lowpan: Fix initialization for fragment offset

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Date:	Wed, 13 Mar 2013 10:38:30 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	poettner@....cs.tu-bs.de
Cc:	Linux-zigbee-devel@...ts.sourceforge.net,
	alex.bluesman.smirnov@...il.com, dbaryshkov@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net/ieee802154/6lowpan: Fix initialization for
 fragment offset

From: Wolf-Bastian Pöttner <poettner@....cs.tu-bs.de>
Date: Wed, 13 Mar 2013 08:50:54 +0100

> offset has to be initialized, otherwise the *first* fragment will
> be discarded and reassembly cannot happen.
> 
> Reviewed-by: Alan Ott <alan@...nal11.us>

'offset' is never used unless lowpan_fetch_skb_u8(skb, &offset)
succeeds, in which case it will be initialized properly.  Otherwise we
unlock and drop the SKB and make no references whatsoever to 'offset'.

I suspect you saw some compiler warning about 'offset' being
uninitialized, and are just blindly trying to shut this warning up.
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