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conn: set unused OOB to zero length

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Otherwise in the event that we're using GSO without sticky sockets, we
pass garbage OOB buffers to sendmmsg, making a EINVAL, when GSO doesn't
set its header.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2023-10-21 19:32:07 +02:00
parent f502ec3fad
commit b3df23dcd4
1 changed files with 2 additions and 1 deletions
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3
conn/bind_std.go
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@ -65,7 +65,7 @@ func NewStdNetBind() Bind {
msgs := make([]ipv6.Message, IdealBatchSize) msgs := make([]ipv6.Message, IdealBatchSize)
for i := range msgs { for i := range msgs {
msgs[i].Buffers = make(net.Buffers, 1) msgs[i].Buffers = make(net.Buffers, 1)
msgs[i].OOB = make([]byte, stickyControlSize+gsoControlSize) msgs[i].OOB = make([]byte, 0, stickyControlSize+gsoControlSize)
} }
return &msgs return &msgs
}, },
@ -200,6 +200,7 @@ again:
func (s *StdNetBind) putMessages(msgs *[]ipv6.Message) { func (s *StdNetBind) putMessages(msgs *[]ipv6.Message) {
for i := range *msgs { for i := range *msgs {
(*msgs)[i].OOB = (*msgs)[i].OOB[:0]
(*msgs)[i] = ipv6.Message{Buffers: (*msgs)[i].Buffers, OOB: (*msgs)[i].OOB} (*msgs)[i] = ipv6.Message{Buffers: (*msgs)[i].Buffers, OOB: (*msgs)[i].OOB}
} }
s.msgsPool.Put(msgs) s.msgsPool.Put(msgs)