libceph: fix multiple unsafe decodes in decode_locker()

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CVE-2026-80561 · Microsoft / collected KEV context

cve-program · CVE-2026-80561

• https://git.kernel.org/stable/c/1ed45c8d96498725eb54f740172f9068d8673906
• https://git.kernel.org/stable/c/6265103e78f0ee7e2518de9cf938b94bee9700a0
• https://git.kernel.org/stable/c/3c3716dc06a34e4ca7f743f5fcfa07fbc5a11070
• https://git.kernel.org/stable/c/fa4aa86fff0c56799c2e3f51a88879053285f4a9
• https://git.kernel.org/stable/c/dbfd83f722a78446ec18a476ef7a38e52240b50a
• https://git.kernel.org/stable/c/d1bba38574d095f191557d397d9633f08cd966b1
• https://git.kernel.org/stable/c/51c8d238fe7236de627ab1a1433694552a904136
• https://git.kernel.org/stable/c/437b6551cfcc235eea1d735a874f9d421f555e17

No related operational record is retained in the current change model.