Andrew Chow 93999a5fbe Merge bitcoin/bitcoin#25642: Don't wrap around when deriving an extended key at a too large depth ...

fb9faffae3 extended keys: fail to derive too large depth instead of wrapping around (Antoine Poinsot)
8dc6670ce1 descriptor: don't assert success of extended key derivation (Antoine Poinsot)
50cfc9e761 (pubk)key: mark Derive() as nodiscard (Antoine Poinsot)
0ca258a5ac descriptor: never ignore the return value when deriving an extended key (Antoine Poinsot)
d3599c22bd spkman: don't ignore the return value when deriving an extended key (Antoine Poinsot)

Pull request description:

  We would previously  silently wrap the derived child's depth back to `0`. Instead, explicitly fail when trying to derive an impossible depth, and handle the error in callers.

  An extended fuzzing corpus of `descriptor_parse` triggered this behaviour, which was reported by MarcoFalke.

  Fixes #25751.

ACKs for top commit:
  achow101:
    re-ACK fb9faffae3
  instagibbs:
    utACK  fb9faffae3

Tree-SHA512: 9f75c23572ce847239bd15e5497df2960b6bd63c61ea72347959d968b5c4c9a4bfeee284e76bdcd7bacbf9eeb70feee85ffd3e316f353ca6eca30e93aafad343

2022-08-10 14:25:43 -04:00

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