1 files changed, 4 insertions, 0 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 5a0ba9788cdd..7f8cfe9d9b4d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3186,8 +3186,12 @@ static int special_mapping_mremap(struct vm_area_struct *new_vma)
 {
         struct vm_special_mapping *sm = new_vma->vm_private_data;
 
+        if (WARN_ON_ONCE(current->mm != new_vma->vm_mm))
+                return -EFAULT;
+
         if (sm->mremap)
                 return sm->mremap(sm, new_vma);
+
         return 0;
 }