s390/pkey: Prevent overflow in size calculation for memdup_user()

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2025-38257 · Microsoft / collected KEV context

cve-program · CVE-2025-38257

• https://git.kernel.org/stable/c/ad1bdd24a02d5a8d119af8e4cd50933780a6d29f
• https://git.kernel.org/stable/c/faa1ab4a23c42e34dc000ef4977b751d94d5148c
• https://git.kernel.org/stable/c/88f3869649edbc4a13f6c2877091f81cd5a50f05
• https://git.kernel.org/stable/c/f855b119e62b004a5044ed565f2a2b368c4d3f16
• https://git.kernel.org/stable/c/73483ca7e07a5e39bdf612eec9d3d293e8bef649
• https://git.kernel.org/stable/c/7360ee47599af91a1d5f4e74d635d9408a54e489

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