fix(ffmpeg): complete CVE-2026-8461 backport in MagicYUV decoder#33
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Backport full upstream fix (PR #23159): slice_height alignment check, progressive-mode sanity check, 1-line MEDIAN OOB read guard. 补全 CVE-2026-8461 上游修复 (PR #23159): slice_height 对齐校验、 progressive 模式边界校验、1 行 MEDIAN slice 越界读保护。 Log: 补全 MagicYUV CVE-2026-8461 修复 PMS: BUG-367679 Influence: 修复前一deepin2 patch 仅覆盖隔行校验，slice_height 对齐与 1 行 MEDIAN 路径仍可触发堆越界读写；补全后三触发路径全部拦截。
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Backport full upstream fix (PR #23159): slice_height alignment check, progressive-mode sanity check, 1-line MEDIAN OOB read guard.
补全 CVE-2026-8461 上游修复 (PR #23159): slice_height 对齐校验、 progressive 模式边界校验、1 行 MEDIAN slice 越界读保护。
Log: 补全 MagicYUV CVE-2026-8461 修复
PMS: BUG-367679
Influence: 修复前一deepin2 patch 仅覆盖隔行校验，slice_height 对齐与 1 行 MEDIAN 路径仍可触发堆越界读写；补全后三触发路径全部拦截。