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packet: reset network header if packet shorter than ll reserved space

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[ Upstream commit 993675a310 ]

If variable length link layer headers result in a packet shorter
than dev->hard_header_len, reset the network header offset. Else
skb->mac_len may exceed skb->len after skb_mac_reset_len.

packet_sendmsg_spkt already has similar logic.

Fixes: b84bbaf7a6 ("packet: in packet_snd start writing at link layer allocation")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Willem de Bruijn 2018-07-11 12:00:45 -04:00 committed by Greg Kroah-Hartman
parent edf81993dc
commit 75425326b8
1 changed files with 2 additions and 0 deletions
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2
net/packet/af_packet.c
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@ -2919,6 +2919,8 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
goto out_free;
} else if (reserve) {
skb_reserve(skb, -reserve);
if (len < reserve)
skb_reset_network_header(skb);
}
/* Returns -EFAULT on error */