diff options
| author | Jason Wang <jasowang@redhat.com> | 2013-07-10 13:43:27 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-07-10 18:45:52 -0700 |
| commit | 3dd5c3308e8b671e8e8882ba972f51cefbe9fd0d (patch) | |
| tree | fe4138595758de2c756740239bf214a819b490d4 /virt/kvm/irq_comm.c | |
| parent | 440d57bc5ff55ec1efb3efc9cbe9420b4bbdfefa (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>
Diffstat (limited to 'virt/kvm/irq_comm.c')
0 files changed, 0 insertions, 0 deletions