macvtap: Fix macvtap_open races in the zero copy enable code.

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To see if it is appropriate to enable the macvtap zero copy feature
don't test the lowerdev network device flags.   Instead test the
macvtap network device flags which are a direct copy of the lowerdev
flags.  This is important because nothing holds a reference to lowerdev
and on a very bad day we lowerdev could be a pointer to stale memory.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric W. Biederman 2011-10-20 04:26:39 +00:00 • committed by David S. Miller

parent 99f34b38cd

commit 047af9cfed

1 changed files with 5 additions and 6 deletions

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drivers/net/macvtap.c

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