diff options
| -rw-r--r-- | mm/userfaultfd.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 5e718014e671..216ab4c8621f 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -1078,9 +1078,18 @@ retry: /* at this point we have src_folio locked */ if (folio_test_large(src_folio)) { + /* split_folio() can block */ + pte_unmap(&orig_src_pte); + pte_unmap(&orig_dst_pte); + src_pte = dst_pte = NULL; err = split_folio(src_folio); if (err) goto out; + /* have to reacquire the folio after it got split */ + folio_unlock(src_folio); + folio_put(src_folio); + src_folio = NULL; + goto retry; } if (!src_anon_vma) { |