diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2025-04-09 12:40:43 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-04-11 17:32:41 -0700 |
| commit | a995199384347261bb3f21b2e171fa7f988bd2f8 (patch) | |
| tree | f4cd49728ffc22dc98913869d66d3e5b9a013d6b /mm | |
| parent | 92868577d05ff75f9f38c6345ed275203827faba (diff) | |
mm: fix apply_to_existing_page_range()
In the case of apply_to_existing_page_range(), apply_to_pte_range() is
reached with 'create' set to false. When !create, the loop over the PTE
page table is broken.
apply_to_pte_range() will only move to the next PTE entry if 'create' is
true or if the current entry is not pte_none().
This means that the user of apply_to_existing_page_range() will not have
'fn' called for any entries after the first pte_none() in the PTE page
table.
Fix the loop logic in apply_to_pte_range().
There are no known runtime issues from this, but the fix is trivial enough
for stable@ even without a known buggy user.
Link: https://lkml.kernel.org/r/20250409094043.1629234-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Fixes: be1db4753ee6 ("mm/memory.c: add apply_to_existing_page_range() helper")
Cc: Daniel Axtens <dja@axtens.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/memory.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c index 1a35165622e1..44481fe7c629 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2938,11 +2938,11 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd, if (fn) { do { if (create || !pte_none(ptep_get(pte))) { - err = fn(pte++, addr, data); + err = fn(pte, addr, data); if (err) break; } - } while (addr += PAGE_SIZE, addr != end); + } while (pte++, addr += PAGE_SIZE, addr != end); } *mask |= PGTBL_PTE_MODIFIED; |