From: Willem de Bruijn <willemb@google.com>
Date: Tue, 26 Sep 2017 12:20:17 -0400
Subject: packet: only test po->has_vnet_hdr once in packet_snd
Patch-mainline: v4.14-rc4
Git-commit: da7c9561015e93d10fe6aab73e9288e0d09d65a6
References: bsc#1076830
Packet socket option po->has_vnet_hdr can be updated concurrently with
other operations if no ring is attached.
Do not test the option twice in packet_snd, as the value may change in
between calls. A race on setsockopt disable may cause a packet > mtu
to be sent without having GSO options set.
Fixes: bfd5f4a3d605 ("packet: Add GSO/csum offload support.")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Michal Kubecek <mkubecek@suse.cz>
---
net/packet/af_packet.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 3310711b37a9..4ac2581b0ea1 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2840,6 +2840,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
struct virtio_net_hdr vnet_hdr = { 0 };
int offset = 0;
struct packet_sock *po = pkt_sk(sk);
+ bool has_vnet_hdr = false;
int hlen, tlen, linear;
int extra_len = 0;
@@ -2883,6 +2884,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
err = packet_snd_vnet_parse(msg, &len, &vnet_hdr);
if (err)
goto out_unlock;
+ has_vnet_hdr = true;
}
if (unlikely(sock_flag(sk, SOCK_NOFCS))) {
@@ -2941,7 +2943,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
skb->priority = sk->sk_priority;
skb->mark = sockc.mark;
- if (po->has_vnet_hdr) {
+ if (has_vnet_hdr) {
err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le());
if (err)
goto out_free;
--
2.16.2