memory usage error

[BeneficialCode]

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What version of shadowsocks-libev are you using?

v3.3.5

What operating system are you using?

Windows 10 21H2

What did you do?

I read the code.

What did you expect to see?

The correct code.

What did you see instead?

The error code.

What is your config in detail (with all sensitive info masked)?

LIB_ONLY

Issue:
When use ss-local as LIB_ONLY. The _start_ss_local_server's local variable struct sockaddr_storage storage is a stack variable. But it pass into the init_udprelay. So when we close gracefully, it will call the free_udprelay. This function will free the server_ctx->remote_addr. You know, this is not a heap variable. This is the problem. We should use ss_malloc to allocate the storage variable.