CVE-2026-89806: Undefined Security Weakness

In the Linux kernel, the following vulnerability has been resolved:

drm/sysfb: ofdrm: Fix integer overflow in fb_size calculation

The framebuffer size calculation `fb_size = linebytes * height` can overflow when both values are large (e.g., 46341 * 46341 > INT_MAX). Since linebytes and height are both int types, the multiplication is performed as int * int, which results in undefined behavior on overflow.

Use check_mul_overflow() to detect and prevent this overflow, consistent with the approach used in simpledrm.c and corebootdrm.c.