diff options
| author | Joao Martins <[email protected]> | 2021-07-14 21:27:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-07-15 10:13:49 -0700 |
| commit | d08af0a59684e18a51aa4bfd24c658994ea3fc5b (patch) | |
| tree | 20183f284e5c2d7f150ed5d359699491ad221af4 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | b3b2177a2d795e35dc11597b2609eb1e7e57e570 (diff) | |
mm/hugetlb: fix refs calculation from unaligned @vaddr
Commit 82e5d378b0e47 ("mm/hugetlb: refactor subpage recording")
refactored the count of subpages but missed an edge case when @vaddr is
not aligned to PAGE_SIZE e.g. when close to vma->vm_end. It would then
errousnly set @refs to 0 and record_subpages_vmas() wouldn't set the
@pages array element to its value, consequently causing the reported
null-deref by syzbot.
Fix it by aligning down @vaddr by PAGE_SIZE in @refs calculation.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 82e5d378b0e47 ("mm/hugetlb: refactor subpage recording")
Reported-by: [email protected]
Signed-off-by: Joao Martins <[email protected]>
Reviewed-by: Mike Kravetz <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions