High [CVE-2026-74721] Fix page-insertion errors in amdxdna_insert_pages

In the Linux kernel, the following vulnerability has been resolved: accel/amxdna: Fix page-insertion errors in amdxdna_insert_pages() Two error paths in amdxdna_insert_pages() called vma->vm_ops->close(vma) before returning an error code to the caller.

This is incorrect: amdxdna_gem_obj_mmap() registers an HMM interval notifier before calling amdxdna_insert_pages(), and on a hard error it jumps to hmm_unreg to undo that registration.

Calling vm_ops->close() manually — which drops the shmem pages_pin_count and the GEM object reference that backs the VMA — before the mmap syscall has even returned causes those resources to be released while the VMA is still alive.

The kernel VMA teardown will call vm_ops->close() a second time when the process later unmaps the range, producing a reference count underflow. Replace both hard-error returns with a deferred-fault approach that keeps the VMA alive and retries page insertion through the HMM range-fault path.

Specifically, an error in the `amdxdna_insert_pages()` function causes system resources to be released too early. This premature release can lead to a critical error when the system later attempts to free the same resources, resulting in a reference count underflow.

This vulnerability could allow a local attacker to cause the system to crash, leading to a denial of service.