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credentials/alts: Add comments to clarify buffer sizing #8232

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merged 1 commit into from
Apr 8, 2025
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credentials/alts: Add comments to clarify buffer sizing #8232

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7 changes: 6 additions & 1 deletion credentials/alts/internal/conn/record.go
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Original file line number Diff line number Diff line change
Expand Up @@ -166,7 +166,12 @@ func (p *conn) Read(b []byte) (n int, err error) {
panic(fmt.Sprintf("protected buffer length shorter than expected: %d vs %d", len(p.protected), MsgLenFieldSize))
}
oldProtectedBuf := p.protected
p.protected = make([]byte, int(length)+MsgLenFieldSize)
// The new buffer must be able to hold the message length header
// and the entire message.
requiredCapacity := int(length) + MsgLenFieldSize
p.protected = make([]byte, requiredCapacity)
// Copy the contents of the old buffer and set the length of the
// new buffer to the number of bytes already read.
copy(p.protected, oldProtectedBuf)
p.protected = p.protected[:len(oldProtectedBuf)]
}
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