From: Jason Wang <jasowang@redhat.com>
Date: Wed, 2 May 2012 03:42:15 +0000 (+0800)
Subject: macvtap: zerocopy: validate vectors before building skb
X-Git-Tag: v3.5-rc1~109^2~146^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b92946e2919134ebe2a4083e4302236295ea2a73;p=pandora-kernel.git

macvtap: zerocopy: validate vectors before building skb

There're several reasons that the vectors need to be validated:

- Return error when caller provides vectors whose num is greater than UIO_MAXIOV.
- Linearize part of skb when userspace provides vectors grater than MAX_SKB_FRAGS.
- Return error when userspace provides vectors whose total length may exceed
- MAX_SKB_FRAGS * PAGE_SIZE.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

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