--- x/mm/vma.c
+++ y/mm/vma.c
@@ -1615,16 +1615,16 @@ static struct vm_area_struct *vma_modify
 		   (vma->vm_start != start || vma->vm_end != end));
 
 	/* Split any preceding portion of the VMA. */
-	if (vma->vm_start < start) {
-		int err = split_vma(vmg->vmi, vma, start, 1);
+	if (vma->vm_start < vmg->start) {
+		int err = split_vma(vmg->vmi, vma, vmg->start, 1);
 
 		if (err)
 			return ERR_PTR(err);
 	}
 
 	/* Split any trailing portion of the VMA. */
-	if (vma->vm_end > end) {
-		int err = split_vma(vmg->vmi, vma, end, 0);
+	if (vma->vm_end > vmg->end) {
+		int err = split_vma(vmg->vmi, vma, vmg->end, 0);
 
 		if (err)
 			return ERR_PTR(err);