packet: validate variable length ll headers

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[ Upstream commit 9ed988cd59 ]

Replace link layer header validation check ll_header_truncate with
more generic dev_validate_header.

Validation based on hard_header_len incorrectly drops valid packets
in variable length protocols, such as AX25. dev_validate_header
calls header_ops.validate for such protocols to ensure correctness
below hard_header_len.

See also http://comments.gmane.org/gmane.linux.network/401064

Fixes 9c7077622d ("packet: make packet_snd fail on len smaller than l2 header")
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 2016-03-09 21:58:34 -05:00 • committed by Greg Kroah-Hartman

parent abd4258777

commit edb60bc7bb

1 changed files with 16 additions and 21 deletions

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net/packet/af_packet.c

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