tun: freebsd: avoid OOB writes
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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@ -8,6 +8,7 @@ package tun
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import (
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"errors"
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"fmt"
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"io"
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"net"
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"os"
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"sync"
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@ -347,7 +348,13 @@ func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {
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}
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func (tun *NativeTun) Write(buf []byte, offset int) (int, error) {
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if offset < 4 {
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return 0, io.ErrShortBuffer
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}
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buf = buf[offset-4:]
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if len(buf) < 5 {
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return 0, io.ErrShortBuffer
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}
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buf[0] = 0x00
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buf[1] = 0x00
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buf[2] = 0x00
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