diff options
| -rw-r--r-- | mm/memory.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/memory.c b/mm/memory.c index 6d058973a97e..4785aecca9a8 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -903,6 +903,17 @@ copy_present_page(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma if (likely(!page_needs_cow_for_dma(src_vma, page))) return 1; + /* + * The vma->anon_vma of the child process may be NULL + * because the entire vma does not contain anonymous pages. + * A BUG will occur when the copy_present_page() passes + * a copy of a non-anonymous page of that vma to the + * page_add_new_anon_rmap() to set up new anonymous rmap. + * Return 1 if the page is not an anonymous page. + */ + if (!PageAnon(page)) + return 1; + new_page = *prealloc; if (!new_page) return -EAGAIN; |