[InterNetNews/inn] 347168: Reject oversized wire-format conversions

[Kevin Bowling]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 34716891a4a8e630ee3ea96b9b1f74b8b2514272
      https://github.com/InterNetNews/inn/commit/34716891a4a8e630ee3ea96b9b1f74b8b2514272
  Author: Kevin Bowling <kevin.bowling at kev009.com>
  Date:   2026-08-13 (Thu, 13 Aug 2026)

  Changed paths:
    M backends/innxmit.c
    M frontends/rnews.c
    M frontends/sm.c
    M include/inn/wire.h
    M lib/wire.c
    M storage/tradspool/tradspool.c
    M tests/innd/artparse-t.c
    M tests/lib/wire-t.c
    M tests/overview/xref-t.c

  Log Message:
  -----------
  Reject oversized wire-format conversions

Check wire-format growth before allocation and propagate conversion
failures through article readers and callers.  Keep the historical
tradspool article-size policy while storing representable lengths
without narrowing.

see #372



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