diff mbox series

mm/mmap: Fix copy_vma() new_vma check

Message ID 20220706003522.1827240-1-Liam.Howlett@oracle.com (mailing list archive)
State New
Headers show
Series mm/mmap: Fix copy_vma() new_vma check | expand

Commit Message

Liam R. Howlett July 6, 2022, 12:35 a.m. UTC 
When checking new_vma limits to ensure they are not within where the
copy of the vma will be placed, ensure new_vma is not NULL.

Fixes: ded0cf440d9b (mm: remove the vma linked list)
Reported-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---
 mm/mmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/mm/mmap.c b/mm/mmap.c
index dacc01b0126a..9eb663cde5c7 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3293,7 +3293,7 @@  struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
 	}
 
 	new_vma = find_vma_prev(mm, addr, &prev);
-	if (new_vma->vm_start < addr + len)
+	if (new_vma && new_vma->vm_start < addr + len)
 		return NULL;	/* should never get here */
 
 	new_vma = vma_merge(mm, prev, addr, addr + len, vma->vm_flags,