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RFC 5531 assigns only unsigned constants to program, version, and procedure numbers (Section 12.3) and encodes each as an unsigned 32-bit integer (Section 9), so a valid number falls within [0, 2**32 - 1]. RFC 4506 Section 6.2 permits a signed decimal constant for XDR constants in general and sets no ceiling on magnitude, so the grammar accepts an out-of-range value without complaint. It reaches generated code -- a negative procedure number emerges as an enumerator such as "FOO = -5", valid C that compiles cleanly even though the wire field is an unsigned 32-bit integer. Thus the xdrgen front end is the only place that can reject the malformed value. Extend the semantic checks to require each program, version, and procedure number to fall within [0, 2**32 - 1]. Link: https://patch.msgid.link/20260712203451.124902-6-cel@kernel.org Signed-off-by: Chuck Lever <cel@kernel.org>