[PATCH v2 0/2] mm/page_isolation: fix UBSAN shift-out-of-bounds in isolate_single_pageblock

[Qi Xi]

Patch 1 fixes a UBSAN shift-out-of-bounds warning in the PageBuddy branch
of isolate_single_pageblock() triggered by concurrent buddy allocation.

Patch 2 addresses the same class of issue in the PageCompound branch, where
racy compound_order() and compound_head() reads could lead to out-of-range
shifts or incorrect page skipping.

Changes since v1:
- Patch 1: drop VM_WARN_ON_ONCE, bail out with -EBUSY instead
- Patch 2: new patch addressing PageCompound branch race


Qi Xi (2):
  mm/page_isolation: fix UBSAN shift-out-of-bounds warning
  mm/page_isolation: guard compound_order() against racing

 mm/page_isolation.c | 36 ++++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

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2.33.0