[PATCH 01/45] s390: fixup for kvm

[Avi Kivity]

From: Carsten Otte <cotte@xxxxxxxxxx>

Temporary commit, should appear in mainline shortly.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
---
 arch/s390/lib/uaccess_pt.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c
index 5efdfe9..d68b2ee 100644
--- a/arch/s390/lib/uaccess_pt.c
+++ b/arch/s390/lib/uaccess_pt.c
@@ -365,6 +365,9 @@ int futex_atomic_op_pt(int op, int __user *uaddr, int oparg, int *old)
 {
 	int oldval = 0, newval, ret;
 
+	if (!current->mm)
+		return -EFAULT;
+
 	spin_lock(&current->mm->page_table_lock);
 	uaddr = (int __user *) __dat_user_addr((unsigned long) uaddr);
 	if (!uaddr) {
-- 
1.5.5

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