From e775e9ae53167838d07eebecb561bc33c107e04f Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 15 Jun 2012 17:43:25 +0200
Subject: [PATCH] --- yaml --- r: 312228 b: refs/heads/master c:
 cc359d180fa9c25a4c1819f17e07a422d788353d h: refs/heads/master v: v3

---
 [refs]                        | 2 +-
 trunk/kernel/events/uprobes.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index d701dea3a62e..7a0ef0918845 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ea131377148cdfe90641b42ae9aa5a6b3a4fa327
+refs/heads/master: cc359d180fa9c25a4c1819f17e07a422d788353d
diff --git a/trunk/kernel/events/uprobes.c b/trunk/kernel/events/uprobes.c
index f0d04530af63..604930bf9c92 100644
--- a/trunk/kernel/events/uprobes.c
+++ b/trunk/kernel/events/uprobes.c
@@ -610,6 +610,9 @@ __copy_insn(struct address_space *mapping, struct vm_area_struct *vma, char *ins
 	if (!filp)
 		return -EINVAL;
 
+	if (!mapping->a_ops->readpage)
+		return -EIO;
+
 	idx = (unsigned long)(offset >> PAGE_CACHE_SHIFT);
 	off1 = offset &= ~PAGE_MASK;