Claude review: drm/xe: use krealloc_array to prevent integer overflow

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Overall Series Review

Subject: drm/xe: use krealloc_array to prevent integer overflow
Author: "Baoli.Zhang" <baoli.zhang@linux.intel.com>
Patches: 1
Reviewed: 2026-03-25T07:53:35.984719

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This is a single-patch series that mechanically replaces `krealloc()` with `krealloc_array()` in two xe driver files. The change is correct in principle — `krealloc_array()` adds an internal overflow check on the multiplication of `count * element_size` — but the practical overflow risk in both call sites is negligible:

1. In `xe_configfs.c`, `count` is a `ssize_t` derived from parsing a user-provided configfs page (bounded by page size), and `sizeof(u32)` is 4. Overflow of `count * 4` is not realistic.
2. In `xe_vm_madvise.c`, `max_vmas` is an `int` starting at 8 and doubling. It would need to reach ~2^30 entries (billions of VMAs) before `max_vmas * sizeof(pointer)` overflows, which is impossible in practice.

That said, using `krealloc_array()` is the accepted kernel coding convention for array allocations and tools like Coccinelle flag these patterns, so the change is reasonable as a hardening/cleanup measure.

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