macvlan: Fix potential use-after free for broadcasts

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When we postpone a broadcast packet we save the source port in
the skb if it is local.  However, the source port can disappear
before we get a chance to process the packet.

This patch fixes this by holding a ref count on the netdev.

It also delays the skb->cb modification until after we allocate
the new skb as you should not modify shared skbs.

Fixes: 412ca1550c ("macvlan: Move broadcasts into a work queue")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Herbert Xu 2016-06-01 11:43:00 +08:00 • committed by David S. Miller

parent 595d0b2946

commit 260916dfb4

1 changed files with 8 additions and 2 deletions

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drivers/net/macvlan.c

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