diff --git a/arch/um/include/um_mmu.h b/arch/um/include/um_mmu.h
index 82865fcf6872eb0e7347d17ecd64cfc408240a02..f575ff91f2a01796951c90090542b18344e6998b 100644
--- a/arch/um/include/um_mmu.h
+++ b/arch/um/include/um_mmu.h
@@ -13,6 +13,7 @@
 typedef struct mm_context {
 	struct mm_id id;
 	struct uml_ldt ldt;
+	struct page **stub_pages;
 } mm_context_t;
 
 extern void __switch_mm(struct mm_id * mm_idp);
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 78b3e9f69d57d6a81d9ac446e9f6edc16586e5fe..0cd9a7a05e777bf79447af2338a9f6aaa784281d 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -91,6 +91,8 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
 		goto out_free;
 	}
 
+	to_mm->stub_pages = NULL;
+
 	return 0;
 
  out_free:
@@ -126,6 +128,7 @@ void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
 
 	pages[0] = virt_to_page(&__syscall_stub_start);
 	pages[1] = virt_to_page(mm->context.id.stack);
+	mm->context.stub_pages = pages;
 
 	/* dup_mmap already holds mmap_sem */
 	err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,
@@ -147,6 +150,8 @@ void arch_exit_mmap(struct mm_struct *mm)
 {
 	pte_t *pte;
 
+	if (mm->context.stub_pages != NULL)
+		kfree(mm->context.stub_pages);
 	pte = virt_to_pte(mm, STUB_CODE);
 	if (pte != NULL)
 		pte_clear(mm, STUB_CODE, pte);