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descriptor: reject trailing characters after the closing parenthesis - #10948
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The parser located a descriptor's closing parenthesis with rindex but did not verify it was the final character, so trailing bytes after it were silently discarded and pkh(<key>)garbage was accepted as pkh(<key>). Require the closing parenthesis to end the expression and raise ValueError naming the trailing text.
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_get_func_exprfinds the closing parenthesis withrindex, but nothing checks that it is the final character, so trailing text after a descriptor's outer)is silently dropped:pkh(<key>)garbageparses aspkh(<key>).Bitcoin Core rejects trailing bytes —
Funcinsrc/script/parsing.cpprequires the closing parenthesis to be the span's last character. This makes_get_func_exprdo the same, raisingValueErrorand naming the trailing text.The checksum is stripped before parsing.
_get_func_expronly ever receives a standalonefunc(...)expression. So no valid descriptor is affected, and the existing tests pass unchanged. A regression test covers a flat and a nested case.The same fix for HWI, which shares this descriptor code, is bitcoin-core/HWI#858.
Written with LLM, a computer and the Internet; the mistakes, as usual, are all mine.