diff options
| author | Willem de Bruijn <willemb@google.com> | 2018-07-11 12:00:45 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-24 13:09:17 +0200 |
| commit | 75425326b88ccdbcdecc652b1f6f672c0bd286d0 (patch) | |
| tree | 0ad4ab2efe6ebfe51c88014743baa0fe56c6cc04 | |
| parent | edf81993dc293d9048fce2076a0b9182cd6ac07e (diff) | |
| download | linux-75425326b88ccdbcdecc652b1f6f672c0bd286d0.tar.gz | |
packet: reset network header if packet shorter than ll reserved space
[ Upstream commit 993675a3100b16a4c80dfd70cbcde8ea7127b31d ]
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: b84bbaf7a6c8 ("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>
| -rw-r--r-- | net/packet/af_packet.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 27dafe36f29c0..409b288c13d1b 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -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 */ |