High [CVE-2026-53329] Use krealloc_array in dal_vector_reserve

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Use krealloc_array() in dal_vector_reserve() [Why & How] dal_vector_reserve() computes the allocation size as "capacity * vector->struct_size" using uint32_t arithmetic, which can silently wrap to a small value on overflow.

This would cause krealloc to return a smaller buffer than expected, leading to heap overflows on subsequent vector appends.

Replace krealloc() with krealloc_array() which performs an internal overflow check and returns NULL on wrap, preventing the issue. (cherry picked from commit 37668568641ccc4cc1dbca4923d0a16609dd5707) The `dal_vector_reserve()` function calculates memory allocation size using 32-bit arithmetic, which can lead to an integer overflow.

This overflow causes a smaller memory buffer to be allocated than intended, resulting in a heap overflow when data is subsequently appended to the vector. An attacker could potentially use this to cause a denial of service or execute arbitrary code.

Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-787.

Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2026:57251, RHSA-2026:55765, RHSA-2026:55764, RHSA-2026:57252.

Affected products named by the advisory: Red Hat package: kernel-rt.