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authorWillem de Bruijn <willemb@google.com>2017-09-26 12:20:17 -0400
committerDavid S. Miller <davem@davemloft.net>2017-09-28 10:24:31 -0700
commitda7c9561015e93d10fe6aab73e9288e0d09d65a6 (patch)
treef7b60e018e78a975e17e327f614e6dddb07ea306 /net
parent4971613c1639d8e5f102c4e797c3bf8f83a5a69e (diff)
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packet: only test po->has_vnet_hdr once in packet_snd
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>
Diffstat (limited to 'net')
-rw-r--r--net/packet/af_packet.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index a10c2836465c..bec01a3daf5b 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;