mm: fix NULL ptr deref when walking hugepages

[android-x86/kernel.git] / fs / proc / task_mmu.c

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 1030a71..7faaf2a 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -784,7 +784,7 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
 
        /* find the first VMA at or above 'addr' */
        vma = find_vma(walk->mm, addr);
-       if (pmd_trans_huge_lock(pmd, vma) == 1) {
+       if (vma && pmd_trans_huge_lock(pmd, vma) == 1) {
                for (; addr != end; addr += PAGE_SIZE) {
                        unsigned long offset;