未知原因导致aead解密过程出错而崩溃

[dev4u]

最近ss-rust版本做了一次大升级，性能得到提高的同时，有个问题一直困扰着我。
编译系统：fedora 32
rust tool-chain：nightly-x86_64-unknown-linux-gnu (12-30)
rust编译的版本：shadowsocks/shadowsocks-rust@e048bc2
启动命令：

screen -S ss.rust -d -m -L ./ssserver --config shadowsocks.json -v -U --inbound-send-buffer-size 8192 --inbound-recv-buffer-size 8192 --outbound-send-buffer-size 8192 --outbound-recv-buffer-size 8192

运行一段时间，会导致ss服务奔溃。时间周期未测试出来，不过应该跟时间关系不大。
奔溃的日志如下：

thread 'main' panicked at 'assertion failed: aead_pkt.len() >= Self::TAG_LEN', /root/.cargo/registry/src/github.com-1ecc6299db9ec823/shadowsocks-crypto-0.1.0/src/v1/ring.rs:116:9

打开上述的ring.rs文件，定位到116行，代码如下：

#[must_use]
pub fn decrypt_slice(&self, nonce: &[u8], aad: &[u8], aead_pkt: &mut [u8]) -> bool {
    assert_eq!(nonce.len(), Self::NONCE_LEN);
    assert!(aead_pkt.len() >= Self::TAG_LEN);

    let clen = aead_pkt.len() - Self::TAG_LEN;

    let nonce = Nonce::try_assume_unique_for_key(nonce).unwrap();
    let aad   = Aad::from(aad);

    match self.cipher.open_in_place(nonce, aad, aead_pkt) {
        Ok(plaintext) => {
            assert_eq!(plaintext.len(), clen);
            true
        },
        Err(_) => {
            false
        }
    }
}

从逻辑来看没什么毛病，不知如何入手解决，麻烦替我看看怎么处理。

[dev4u]

cc @zonyitoo

[zonyitoo]

Strange. It shouldn't happen.

[dev4u]

Strange. It shouldn't happen.

回去后，我把那几个buffer size参数去掉试试

[zonyitoo]

Please rerun with RUST_BACKTRACE=full

[zonyitoo]

I suspect that it happened because decrypt_payload_aead didn't check the received packet before calling decrypt_packet. Some clients sent invalid UDP packets to your server.

[dev4u]

I suspect that it is happened because decrypt_payload_aead didn't check the received packet before calling decrypt_packet. Some clients send invalid UDP packets to your server.

好的，回去我编译试试。