Merge branch 'bpf-fix-oob-read-and-add-tests-for-load-acquire-store-release'

Merge branch 'bpf-fix-oob-read-and-add-tests-for-load-acquire-store-release'

Kohei Enju says:

====================
bpf: Fix OOB read and add tests for load-acquire/store-release

This patch series addresses an out-of-bounds read issue in
check_atomic_load/store() reported by syzkaller when an invalid register
number (MAX_BPF_REG or greater) is used.

The first patch fixes the actual bug by changing the order of validity
checks, ensuring register validity is checked before atomic_ptr_type_ok()
is called.
It also updates some tests that were assuming the previous order of checks.

The second patch adds new tests specifically for the invalid register
number case to prevent regression in the future.

Changes:
  v3:
    - Change invalid register from R11 to R15 in new tests
  v2: https://lore.kernel.org/all/20250321110010.95217-4-enjuk@amazon.com/
    - Just swap atomic_ptr_type_ok() and check_load_mem()/check_store_reg()
    - Update some tests that were assuming the previous order of checks
    - Add new tests specifically for the invalid register number
  v1: https://lore.kernel.org/bpf/20250314195619.23772-2-enjuk@amazon.com/

Reported-by: syzbot+a5964227adc0f904549c@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=a5964227adc0f904549c
====================

Link: https://patch.msgid.link/20250322045340.18010-4-enjuk@amazon.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>