tap: call skb_probe_transport_header after setting skb->dev

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[ Upstream commit 8c76e77f90 ]

The BPF flow dissector expects either skb->sk or skb->dev set on
all skbs. Delay flow dissection until after skb->dev is set.

This requires calling from within an rcu read-side critical section.
That is fine, see also the call from tun_xdp_one.

Fixes: d0e13a1488 ("flow_dissector: lookup netns by skb->sk if skb->dev is NULL")
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Willem de Bruijn 2018-12-30 17:21:05 -05:00 • committed by Greg Kroah-Hartman

parent 2c1bbe5ddf

commit 3cae5ef1f3

1 changed files with 1 additions and 2 deletions

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drivers/net/tap.c

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