mm/various: give up if pte_offset_map[_lock]() fails

[platform/kernel/linux-starfive.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index c1f2c40..3635629 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -305,6 +305,9 @@ void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
        swp_entry_t entry;
 
        ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
+       if (!ptep)
+               return;
+
        pte = *ptep;
        pte_unmap(ptep);