diff options
| author | Willem de Bruijn <willemb@google.com> | 2017-08-10 12:29:19 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-10 09:52:12 -0700 |
| commit | 85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa (patch) | |
| tree | dcf8a90eb6ae097aa5c962f8bec97e1ce4a5aab7 /net/ipv4/udp.c | |
| parent | 96d9703050a0036a3360ec98bb41e107c90664fe (diff) | |
| download | linux-85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa.tar.gz | |
udp: consistently apply ufo or fragmentation
When iteratively building a UDP datagram with MSG_MORE and that
datagram exceeds MTU, consistently choose UFO or fragmentation.
Once skb_is_gso, always apply ufo. Conversely, once a datagram is
split across multiple skbs, do not consider ufo.
Sendpage already maintains the first invariant, only add the second.
IPv6 does not have a sendpage implementation to modify.
A gso skb must have a partial checksum, do not follow sk_no_check_tx
in udp_send_skb.
Found by syzkaller.
Fixes: e89e9cf539a2 ("[IPv4/IPv6]: UFO Scatter-gather approach")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index e6276fa3750b..a7c804f73990 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -802,7 +802,7 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) if (is_udplite) /* UDP-Lite */ csum = udplite_csum(skb); - else if (sk->sk_no_check_tx) { /* UDP csum disabled */ + else if (sk->sk_no_check_tx && !skb_is_gso(skb)) { /* UDP csum off */ skb->ip_summed = CHECKSUM_NONE; goto send; |