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authorJason Wang <jasowang@redhat.com>2013-07-10 13:43:27 +0800
committerDavid S. Miller <davem@davemloft.net>2013-07-10 18:45:52 -0700
commit3dd5c3308e8b671e8e8882ba972f51cefbe9fd0d (patch)
treefe4138595758de2c756740239bf214a819b490d4 /net
parent440d57bc5ff55ec1efb3efc9cbe9420b4bbdfefa (diff)
tuntap: correctly linearize skb when zerocopy is used
Userspace may produce vectors greater than MAX_SKB_FRAGS. When we try to linearize parts of the skb to let the rest of iov to be fit in the frags, we need count copylen into linear when calling tun_alloc_skb() instead of partly counting it into data_len. Since this breaks zerocopy_sg_from_iovec() since its inner counter assumes nr_frags should be zero at beginning. This cause nr_frags to be increased wrongly without setting the correct frags. This bug were introduced from 0690899b4d4501b3505be069b9a687e68ccbe15b (tun: experimental zero copy tx support) Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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