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Date:   Wed, 01 May 2019 11:31:01 -0400 (EDT)
From:   David Miller <>
Subject: Re: [PATCH net v2] packet: in recvmsg msg_name return at least
 sizeof sockaddr_ll

From: Willem de Bruijn <>
Date: Mon, 29 Apr 2019 11:46:55 -0400

> From: Willem de Bruijn <>
> Packet send checks that msg_name is at least sizeof sockaddr_ll.
> Packet recv must return at least this length, so that its output
> can be passed unmodified to packet send.
> This ceased to be true since adding support for lladdr longer than
> sll_addr. Since, the return value uses true address length.
> Always return at least sizeof sockaddr_ll, even if address length
> is shorter. Zero the padding bytes.
> Change v1->v2: do not overwrite zeroed padding again. use copy_len.
> Fixes: 0fb375fb9b93 ("[AF_PACKET]: Allow for > 8 byte hardware addresses.")
> Suggested-by: David Laight <>
> Signed-off-by: Willem de Bruijn <>

Applied and queued up for -stable.

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