CVE-2026-64097

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

drm/amd/display: Validate GPIO pin LUT table size before iterating

[Why&How] The GPIO pin table parsers in getgpioi2cinfo() and biosparsergetgpiopininfo() derive an element count from the VBIOS tableheader.structuresize field, then iterate over gpiopin[] entries. However, GET_IMAGE() only validates that the table header itself fits within the BIOS image. If the VBIOS reports a structuresize larger than the actual mapped data, the loop reads past the end of the BIOS image, causing an out-of-bounds read.

Fix this by calling biosgetimage() to validate that the full claimed structuresize is accessible within the BIOS image before entering the loop in both functions.

(cherry picked from commit ba5e95b43b773ae1bf1f66ee6b31eb774e65afe3)