mm: check the return value of lookup_page_ext for all call sites

[cascardo/linux.git] / mm / vmstat.c

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 77e42ef..cb2a67b 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1061,6 +1061,8 @@ static void pagetypeinfo_showmixedcount_print(struct seq_file *m,
                                continue;
 
                        page_ext = lookup_page_ext(page);
+                       if (unlikely(!page_ext))
+                               continue;
 
                        if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags))
                                continue;