fix: prevent nil pointer dereference in envoyGoFilterOnHttpData

[johnlanni]

Description

Replace getState() with getOrCreateState() in envoyGoFilterOnHttpData to handle cases where OnHttpData is called before OnHttpHeader.

Problem

When envoyGoFilterOnHttpData is called before envoyGoFilterOnHttpHeader, the s.req pointer is not yet initialized, causing a nil pointer dereference panic:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x7fe25dce3faf]

Solution

• Changed getState(s) to getOrCreateState(s) in line 239
• getOrCreateState checks if the request exists and creates it if needed, preventing the nil pointer access
• This matches the pattern already used in envoyGoFilterOnHttpHeader

Testing

• Fixes the SIGSEGV panic reported in production logs

[lingma-agents]

🔍 代码审查进行中

⏳ 正在审查

⏰️ 剩余时间：约需数分钟

🔄 分支流向: fix-nil-pointer-in-onhttpdata-1.27 ➜ envoy-1.27

📦 提交: 审查当前PR从3fe314c到37c9fd5的提交。

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📒 文件清单 （1 个文件）

📝 变更: 1 个文件

📝 变更文件:

• contrib/golang/filters/http/source/go/pkg/http/shim.go

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