"index out of range" in decryptAES256()

[octo]

panic: runtime error: index out of range

goroutine 1 [running]:
collectd.org/network.decryptAES256(0x7f2c77702004, 0x1, 0x1ffffc, 0x7f2c788a7a80, 0x4c20801e120, 0x0, 0x0, 0x0, 0x0, 0x0)
        /tmp/go-fuzz-build146054357/src/collectd.org/network/crypto.go:216 +0x1122
collectd.org/network.parseEncryptAES256(0x7f2c77702004, 0x1, 0x1ffffc, 0x7f2c788a7a80, 0x4c20801e120, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
        /tmp/go-fuzz-build146054357/src/collectd.org/network/parse.go:221 +0x9d
collectd.org/network.parse(0x7f2c77702000, 0x5, 0x200000, 0x0, 0x7f2c788a7a80, 0x4c20801e120, 0x0, 0x0, 0x0, 0x0, ...)
        /tmp/go-fuzz-build146054357/src/collectd.org/network/parse.go:103 +0xcc1
collectd.org/network.Parse(0x7f2c77702000, 0x5, 0x200000, 0x7f2c788a7a80, 0x4c20801e120, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
        /tmp/go-fuzz-build146054357/src/collectd.org/network/parse.go:34 +0x97
collectd.org/network.Fuzz(0x7f2c77702000, 0x5, 0x200000, 0x3)
        /tmp/go-fuzz-build146054357/src/collectd.org/network/fuzz.go:36 +0x112
github.com/dvyukov/go-fuzz/go-fuzz-dep.Main(0x652508)
        /usr/local/google/home/octo/go/src/github.com/dvyukov/go-fuzz/go-fuzz-dep/main.go:47 +0x13d
main.main()
        /tmp/go-fuzz-build146054357/src/go-fuzz-main/main.go:10 +0x2a
exit status 2