Lennart Poettering
7383a01ffe
The `json_len` variable in `partition_is_luks2_integrity()` is `ssize_t`, but the subtraction `be64toh(header.hdr_len) - LUKS2_FIXED_HDR_SIZE` can yield a value exceeding `SSIZE_MAX` when `hdr_len` is a large crafted value. This causes signed integer overflow and a subsequent oversized `malloc()` that fails with `-ENOMEM`, producing a misleading out-of-memory error instead of a clear invalid-header rejection. Two call sites pass `size = UINT64_MAX`, which neutralizes the existing `hdr_len > size` guard. Add an explicit check against `SSIZE_MAX` before the cast to `ssize_t`.
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