mm: check that we have the right vma in __access_remote_vm()

[cascardo/linux.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index b623a24..ce22a25 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3688,7 +3688,7 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
                         */
 #ifdef CONFIG_HAVE_IOREMAP_PROT
                        vma = find_vma(mm, addr);
-                       if (!vma)
+                       if (!vma || vma->vm_start > addr)
                                break;
                        if (vma->vm_ops && vma->vm_ops->access)
                                ret = vma->vm_ops->access(vma, addr, buf,