diff --git a/mm/mmap.c b/mm/mmap.c
index bddd7f0f88b934ec923576c80809a380b7533eee..7a70757f400803f6946f029fc4b60cab68927662 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1914,6 +1914,8 @@ static unsigned long __mmap_region(struct mm_struct *mm, struct file *file,
 		error = -EINVAL;
 		if (file)
 			goto close_and_free_vma;
+		else if (vma->vm_file)
+			goto unmap_and_free_vma;
 		else
 			goto free_vma;
 	}
@@ -1967,7 +1969,7 @@ static unsigned long __mmap_region(struct mm_struct *mm, struct file *file,
 
 	/* Undo any partial mapping done by a device driver. */
 	unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
-	if (vm_flags & VM_SHARED)
+	if (file && (vm_flags & VM_SHARED))
 		mapping_unmap_writable(file->f_mapping);
 allow_write_and_free_vma:
 	if (vm_flags & VM_DENYWRITE)