netdev - Compiler warning

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Message-ID: <60f98697-952d-aa39-765f-29736de0c4a2@ncentric.com>
Date:   Mon, 4 Feb 2019 12:43:03 +0100
From:   Koen Vandeputte <koen.vandeputte@...ntric.com>
To:     netdev@...r.kernel.org
Subject: Compiler warning

Hi All,

I'm seeing following compiler warning during kernel compilation 
(5.0-rc5  and  4.14.96):


net/core/dev.c: In function 'validate_xmit_skb_list':
net/core/dev.c:3405:15: warning: 'tail' may be used uninitialized in 
this function [-Wmaybe-uninitialized]
     tail->next = skb;
     ~~~~~~~~~~~^~~~~


Source shows this:

https://elixir.bootlin.com/linux/v5.0-rc5/source/net/core/dev.c#L3387

Looks like "tail" can get deferenced while it indeed doesn't get 
initialized? Kind regards, Koen