netdev - Re: [PATCH] rionet: Don't try to corrupt skbuff assigning data pointer directly

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Date:	Thu, 02 Jul 2015 12:12:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	alexander.sverdlin@...ia.com
Cc:	netdev@...r.kernel.org, mporter@...nel.crashing.org,
	alexandre.bounine@....com, frank.kunz@...ia.com,
	marek.krzyzowski@...ia.com
Subject: Re: [PATCH] rionet: Don't try to corrupt skbuff assigning data
 pointer directly

From: Alexander Sverdlin <alexander.sverdlin@...ia.com>
Date: Wed, 1 Jul 2015 15:01:11 +0200

> It's not allowed to assign data pointer of skbuff directly, this makes no sense
> if the assigned pointer is the very same as already existing one, or it brakes
> all the pointer arithmetics in all other cases. We cannot do better as just
> compare them and report BUG() in case of mismatch.
> 
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...ia.com>

BUG takes the entire machine out, which is worse than corrupting the
skb->data

If you really want to assert this condition, do it in a way that
doesn't kill the entire machine.
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