netdev - potential null pointer dereference in drivers/isdn/hisax/isdnl2.c

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Message-ID: <alpine.LNX.2.00.1102032121180.15101@swampdragon.chaosbits.net>
Date:	Thu, 3 Feb 2011 21:27:56 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	netdev@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Karsten Keil <isdn@...ux-pingi.de>
Subject: potential null pointer dereference in drivers/isdn/hisax/isdnl2.c

Hi,

In drivers/isdn/hisax/isdnl2.c:l2_pull_iqueue() we have this:

	...
		skb = alloc_skb(oskb->len + i, GFP_ATOMIC);
		memcpy(skb_put(skb, i), header, i);
	...

If alloc_skb() fails and returns NULL then the second line will cause a 
NULL pointer dereference - skb_put() gives the pointer to 
skb_tail_pointer() which dereferences it.

I'm not quite sure how this should be dealt with, so I'll just report it 
rather than submit a patch. Happy bug fixing :-)

-- 
Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please.

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